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Номер 5.15, страница 70, часть II - гдз по химии 8-9 класс задачник с помощником Гара, Габрусева
Авторы: Гара Н. Н., Габрусева Н. И.
Тип: Задачник с помощником
Издательство: Просвещение
Год издания: 2009 - 2026
Часть: II
Цвет обложки: зелёный, синий
ISBN: 978-5-09-037902-1
Популярные ГДЗ в 8 классе
Часть II. Вычисления по химическим уравнениям. 5. Расчеты по термохимическим уравнениям - номер 5.15, страница 70.
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"updated_at" => null "name" => "номер" "field_cases" => array:6 [ "field_accusative_case" => "номер" "field_creative_case" => "номером" "field_dative_case" => "номеру" "field_genitive_case" => "номера" "field_nominative_case" => "номер" "field_prepositional_case" => "номере" ] "field_short_name" => "№" ] #original: array:6 [ "id" => 26 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "номер" "field_cases" => array:6 [ "field_accusative_case" => "номер" "field_creative_case" => "номером" "field_dative_case" => "номеру" "field_genitive_case" => "номера" "field_nominative_case" => "номер" "field_prepositional_case" => "номере" ] "field_short_name" => "№" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } 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#connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 31 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Часть" "field_cases" => array:6 [ "field_accusative_case" => "Часть" "field_creative_case" => "Частью" "field_dative_case" => "Части" …3 ] "field_page_check_not_needed" => "1" "field_short_name" => "ч." ] #original: array:7 [ "id" => 31 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Часть" "field_cases" => array:6 [ …6] "field_page_check_not_needed" => "1" "field_short_name" => "ч." ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] 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#attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_publisher" => Illuminate\Database\Eloquent\Collection {#1067 #items: array:1 [ 0 => App\Models\Term {#1065 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #original: array:6 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #changes: [] #casts: [] 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"2026-04-10 13:58:26" "updated_at" => null "name" => "Россия" "field_cases" => array:6 [ …6] "field_translit" => "rossiya" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_city" => Illuminate\Database\Eloquent\Collection {#1077 #items: array:1 [ 0 => App\Models\Term {#1074 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 15 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Москва" "field_cases" => array:6 [ …6] "field_translit" => "moskva" ] #original: array:6 [ "id" => 15 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Москва" "field_cases" => array:6 [ …6] "field_translit" => "moskva" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_series" => Illuminate\Database\Eloquent\Collection {#1076 #items: [] #escapeWhenCastingToString: false } "field_umk" => Illuminate\Database\Eloquent\Collection {#1071 #items: [] #escapeWhenCastingToString: false } "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1078 #items: [] #escapeWhenCastingToString: false } "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1079 #items: [] #escapeWhenCastingToString: false } "field_publication_number" => "6" "field_publication_type" => 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"/media/himiya_08/gara-zad-8-9/covers/cover1.webp?ts=1738575678" "alt" => "" "width" => "699" "height" => "933" ] ] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1082 #items: [] #escapeWhenCastingToString: false } "field_new_book" => Illuminate\Database\Eloquent\Collection {#1083 #items: [] #escapeWhenCastingToString: false } "field_old_book" => Illuminate\Database\Eloquent\Collection {#1084 #items: [] #escapeWhenCastingToString: false } "field_url" => "/8-klass/himiya/gara-zadachnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1086 #items: array:2 [ 0 => App\Models\Term {#1085 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 47 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "зелёный" "field_cases" => array:6 [ …6] "field_translit" => "zelyonyy" ] #original: array:6 [ "id" => 47 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "зелёный" "field_cases" => array:6 [ …6] "field_translit" => "zelyonyy" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Term {#1087 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 49 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "синий" "field_cases" => array:6 [ …6] "field_translit" => "siniy" ] #original: array:6 [ "id" => 49 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "синий" "field_cases" => array:6 [ …6] "field_translit" => "siniy" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => "<!--text2--> <p> Надежный способ подготовки к уроку – решение аналогичных задач или наработка опыта. Старшеклассники таким образом могут повторить и проработать изученный материал. Чтобы быть уверенными в качественном закреплении пройденного и отсутствии ошибок, следует сверяться с <strong>ГДЗ по Химии 8-9 класс Задачник с помощником Гара Н.Н., Габрусева Н.И. (Просвещение)</strong>. </p> <p> Пособие включает: </p> <ul> <li>теоретическую часть, представленную в виде основных тезисов и понятий;</li> <li>алгоритмы решения химических задач;</li> <li>тестовые варианты для подготовки к самостоятельным и контрольным работам.</li> </ul> <p> Сборник ответов относится к линейке учебно-методического комплекта по химии Рудзитис Г.Е., Фельдман Ф.Г. Подходит для самоконтроля выполненных домашних упражнений, подготовки к итоговым аттестациям, дополнительной проработки или изучения сложных и пропущенных тем. </p> <h2> Почему решебник по химии нужен каждому ученику? </h2> <p> ГДЗ по химии позволит каждому ученику разобраться с трудными задачками и изучить предмет на «отлично». Основные понятия, химические законы, проведение опытов и экспериментов, наблюдение за протеканием реакций, проведение расчетов - все это поможет изучить <strong>решебник к задачнику по химии Гара (2009-2023) 8-9 класс</strong>. Программа по химии 8-9 классов сконцентрирована на изучении: </p> <ol> <li>Периодического закона и системы химических элементов Д.И. Менделеева.</li> <li>Атомов, ионов и молекул.</li> <li>Порядка распределения электронов в соответствии с энергетическими уровнями.</li> <li>Окислительно-восстановительных реакций.</li> <li>Чистых веществ и смесей.</li> </ol> <p> Ответы к задачнику по химии способствуют более быстрому и успешному усвоению непростой информации. Пособие поможет решить уже образовавшиеся трудности и предотвратить скопление неразобранного материала. Решебник содержит не только численные ответы, но и поэтапные инструкции, необходимые для самостоятельного выполнения домашнего задания. </p> <h2> ГДЗ по химии Гара необходим для учебного процесса </h2> <p> Решебник к сборнику задач по химии содержит правильные развернутые ответы ко всем темам курса 8-9 класса. Повторение и закрепление изученного материала путем решения практических задач гарантирует положительный результат. Если старшеклассник не ленится, выполняет домашние задание и проводит проверку при помощи ГДЗ, то он точно сможет выбиться в первые ряды и всегда получать отличные оценки. </p> <p> ГДЗ к задачнику Гара 8-9 класс обладает множеством преимуществ, остановимся на основных: </p> <ul> <li>пособие доступно в онлайн формате в круглосуточном режиме;</li> <li>для доступа подойдет любой современный гаджет (планшет, смартфон, ноутбук) с выходом в интернет;</li> <li>составлением ответов занимались опытные преподаватели;</li> <li>упражнения упорядочены, поделены на главы, соответствуют учебному изданию;</li> <li>интерфейс понятен и удобен;</li> <li>ответы к заданиям разобраны по пунктам, что позволяет не просто списать результат, а изучить порядок выполнения.</li> </ul> <p> Учеба с решебником по химии (Просвещение) пойдет успешно и весело. </p> <h2> Что найдут старшеклассники в ГДЗ по химии? </h2> <p> Химия – один из сложнейших предметов в разделе естественных наук. Его освоение требует знания правил и владения элементами из периодической таблицы Менделеева. Тщательное изучение предмета особенно необходимо школьникам, планирующим связать свою взрослую жизнь с медицинской профессией. Правильное написание формул и уравнений, составление точного описания свойств веществ или характеристика их состава не всегда дается с первого раза. ГДЗ к задачнику с помощником по химии привьет любовь к предмету и поможет: </p> <ul> <li>разобрать недопонятое (или пропущенное) в школе;</li> <li>правильно оформить домашнюю работу;</li> <li>минимизировать необходимость посещения дополнительных занятий с репетитором;</li> <li>выявить пробелы в знаниях и самостоятельно восполнить их;</li> <li>разобраться в алгоритме выполнения упражнений.</li> </ul> <p> Проверка домашнего задания с решебником к задачнику по химии станет сплошным удовольствием. Ученику не нужно тратить время на поиск – в онлайн-версии все систематизировано и упорядочено или на посещение репетитора (в старших классах сочетать основные уроки и дополнительные занятия достаточно сложно). </p> <p> Для старшеклассников, принявших решение в пользу сдачи экзамена по химии, онлайн-пособие ГДЗ станет незаменимым другом и союзником, доступным в любое удобное время суток. </p> <p> Методическое онлайн-пособие <strong>ГДЗ по химии 8-9 класс (Просвещение) Гара Н.Н., Габрусева Н.И.</strong> – надежный помощник в освоении программы предмета. Подробный разбор заданий, включенных в контрольные работы, описание верной последовательности выполнения лабораторных и практических работ, способы получения ответов на самые сложные вопросы – все это и даже больше найдут старшеклассники в сборнике. Все домашние задания можно выполнить и проверить без посторонней помощи. </p>" "breadcrumbs" => array:3 [ "class" => 379 "subject" => 558 "class_subject" => 498 ] ] #original: array:50 [ "id" => 54 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1062} "field_class" => Illuminate\Database\Eloquent\Collection {#1060} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1067} "field_author" => Illuminate\Database\Eloquent\Collection {#1064} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1070} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1073} "field_country" => Illuminate\Database\Eloquent\Collection {#1075} "field_city" => Illuminate\Database\Eloquent\Collection {#1077} "field_series" => Illuminate\Database\Eloquent\Collection {#1076} "field_umk" => Illuminate\Database\Eloquent\Collection {#1071} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1078} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1079} "field_publication_number" => "6" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1080} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1081} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2009" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебное пособие для общеобразовательных организаций" "field_allowed" => null "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "542" "field_priority" => "20" "field_default_folder" => "/himiya_08/gara-zad-8-9/" "field_isbn" => "978-5-09-037902-1" "field_cover" => array:1 [ 0 => "/media/himiya_08/gara-zad-8-9/covers/cover1.webp?ts=1738575678" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ "path" => "/media/himiya_08/gara-zad-8-9/covers/cover1.webp?ts=1738575678" "alt" => "" "width" => "699" "height" => "933" ] ] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1082} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1083} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1084} "field_url" => "/8-klass/himiya/gara-zadachnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1086} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => "<!--text2--> <p> Надежный способ подготовки к уроку – решение аналогичных задач или наработка опыта. Старшеклассники таким образом могут повторить и проработать изученный материал. Чтобы быть уверенными в качественном закреплении пройденного и отсутствии ошибок, следует сверяться с <strong>ГДЗ по Химии 8-9 класс Задачник с помощником Гара Н.Н., Габрусева Н.И. (Просвещение)</strong>. </p> <p> Пособие включает: </p> <ul> <li>теоретическую часть, представленную в виде основных тезисов и понятий;</li> <li>алгоритмы решения химических задач;</li> <li>тестовые варианты для подготовки к самостоятельным и контрольным работам.</li> </ul> <p> Сборник ответов относится к линейке учебно-методического комплекта по химии Рудзитис Г.Е., Фельдман Ф.Г. Подходит для самоконтроля выполненных домашних упражнений, подготовки к итоговым аттестациям, дополнительной проработки или изучения сложных и пропущенных тем. </p> <h2> Почему решебник по химии нужен каждому ученику? </h2> <p> ГДЗ по химии позволит каждому ученику разобраться с трудными задачками и изучить предмет на «отлично». Основные понятия, химические законы, проведение опытов и экспериментов, наблюдение за протеканием реакций, проведение расчетов - все это поможет изучить <strong>решебник к задачнику по химии Гара (2009-2023) 8-9 класс</strong>. Программа по химии 8-9 классов сконцентрирована на изучении: </p> <ol> <li>Периодического закона и системы химических элементов Д.И. Менделеева.</li> <li>Атомов, ионов и молекул.</li> <li>Порядка распределения электронов в соответствии с энергетическими уровнями.</li> <li>Окислительно-восстановительных реакций.</li> <li>Чистых веществ и смесей.</li> </ol> <p> Ответы к задачнику по химии способствуют более быстрому и успешному усвоению непростой информации. Пособие поможет решить уже образовавшиеся трудности и предотвратить скопление неразобранного материала. Решебник содержит не только численные ответы, но и поэтапные инструкции, необходимые для самостоятельного выполнения домашнего задания. </p> <h2> ГДЗ по химии Гара необходим для учебного процесса </h2> <p> Решебник к сборнику задач по химии содержит правильные развернутые ответы ко всем темам курса 8-9 класса. Повторение и закрепление изученного материала путем решения практических задач гарантирует положительный результат. Если старшеклассник не ленится, выполняет домашние задание и проводит проверку при помощи ГДЗ, то он точно сможет выбиться в первые ряды и всегда получать отличные оценки. </p> <p> ГДЗ к задачнику Гара 8-9 класс обладает множеством преимуществ, остановимся на основных: </p> <ul> <li>пособие доступно в онлайн формате в круглосуточном режиме;</li> <li>для доступа подойдет любой современный гаджет (планшет, смартфон, ноутбук) с выходом в интернет;</li> <li>составлением ответов занимались опытные преподаватели;</li> <li>упражнения упорядочены, поделены на главы, соответствуют учебному изданию;</li> <li>интерфейс понятен и удобен;</li> <li>ответы к заданиям разобраны по пунктам, что позволяет не просто списать результат, а изучить порядок выполнения.</li> </ul> <p> Учеба с решебником по химии (Просвещение) пойдет успешно и весело. </p> <h2> Что найдут старшеклассники в ГДЗ по химии? </h2> <p> Химия – один из сложнейших предметов в разделе естественных наук. Его освоение требует знания правил и владения элементами из периодической таблицы Менделеева. Тщательное изучение предмета особенно необходимо школьникам, планирующим связать свою взрослую жизнь с медицинской профессией. Правильное написание формул и уравнений, составление точного описания свойств веществ или характеристика их состава не всегда дается с первого раза. ГДЗ к задачнику с помощником по химии привьет любовь к предмету и поможет: </p> <ul> <li>разобрать недопонятое (или пропущенное) в школе;</li> <li>правильно оформить домашнюю работу;</li> <li>минимизировать необходимость посещения дополнительных занятий с репетитором;</li> <li>выявить пробелы в знаниях и самостоятельно восполнить их;</li> <li>разобраться в алгоритме выполнения упражнений.</li> </ul> <p> Проверка домашнего задания с решебником к задачнику по химии станет сплошным удовольствием. Ученику не нужно тратить время на поиск – в онлайн-версии все систематизировано и упорядочено или на посещение репетитора (в старших классах сочетать основные уроки и дополнительные занятия достаточно сложно). </p> <p> Для старшеклассников, принявших решение в пользу сдачи экзамена по химии, онлайн-пособие ГДЗ станет незаменимым другом и союзником, доступным в любое удобное время суток. </p> <p> Методическое онлайн-пособие <strong>ГДЗ по химии 8-9 класс (Просвещение) Гара Н.Н., Габрусева Н.И.</strong> – надежный помощник в освоении программы предмета. Подробный разбор заданий, включенных в контрольные работы, описание верной последовательности выполнения лабораторных и практических работ, способы получения ответов на самые сложные вопросы – все это и даже больше найдут старшеклассники в сборнике. Все домашние задания можно выполнить и проверить без посторонней помощи. </p>" "breadcrumbs" => array:3 [ "class" => 379 "subject" => 558 "class_subject" => 498 ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1048 #items: [] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 640185 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Вычисления по химическим уравнениям" "field_branch_order" => "II" "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1050} "field_page_start" => "36" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1058} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1048} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "parent_branches" => Illuminate\Database\Eloquent\Collection {#1112 #items: array:2 [ 0 => App\Models\Branch {#1120 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640185 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Вычисления по химическим уравнениям" "field_branch_order" => "II" "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1121 #items: array:1 [ 0 => App\Models\Term {#1047} ] #escapeWhenCastingToString: false } "field_page_start" => "36" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1122 #items: array:1 [ 0 => App\Models\Book {#1057} ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1123 #items: [] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 640185 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Вычисления по химическим уравнениям" "field_branch_order" => "II" "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1121} "field_page_start" => "36" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1122} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1123} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Branch {#1124 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640190 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "5. Расчеты по термохимическим уравнениям" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1125 #items: [] #escapeWhenCastingToString: false } "field_page_start" => "66" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1126 #items: array:1 [ 0 => App\Models\Book {#1057} ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1127 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 640190 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "5. Расчеты по термохимическим уравнениям" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1125} "field_page_start" => "66" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1126} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1127} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1109 #items: array:3 [ 0 => App\Models\Element {#1102 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 798047 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1094 #items: array:1 [ 0 => App\Models\Edition {#1101 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 1784 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1099 …2} "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "vadim" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1098 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1097 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1095 …2} "field_content_source" => null ] #original: array:21 [ "id" => 1784 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1099 …2} "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "vadim" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1098 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1097 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1095 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "640683" "type" => "task" ] "text" => "<p><strong>5.15.</strong> По термохимическому уравнению реакции</p><p>$2\text{Al}(\text{тв}) + \text{Fe}_2\text{O}_3(\text{тв}) = \text{Al}_2\text{O}_3(\text{тв}) + 2\text{Fe}(\text{тв}) + 848 \text{ кДж}$</p><p>рассчитайте, сколько выделится теплоты при вступлении в реакцию:</p><p><strong>а)</strong> 10,8 г алюминия;</p><p><strong>б)</strong> 0,2 моль оксида железа(III).</p>" "img" => array:1 [ 0 => array:5 [ "name" => "15-1.jpg" "alt" => null "width" => "1389" "height" => 307 "path" => "/media/himiya_08/gara-zad-8-9/0-2-5/15-1.webp?ts=1738579405" ] ] ] #original: array:7 [ "id" => 798047 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1094} "task" => array:2 [ "refs" => "640683" "type" => "task" ] "text" => "<p><strong>5.15.</strong> По термохимическому уравнению реакции</p><p>$2\text{Al}(\text{тв}) + \text{Fe}_2\text{O}_3(\text{тв}) = \text{Al}_2\text{O}_3(\text{тв}) + 2\text{Fe}(\text{тв}) + 848 \text{ кДж}$</p><p>рассчитайте, сколько выделится теплоты при вступлении в реакцию:</p><p><strong>а)</strong> 10,8 г алюминия;</p><p><strong>б)</strong> 0,2 моль оксида железа(III).</p>" "img" => array:1 [ 0 => array:5 [ "name" => "15-1.jpg" "alt" => null "width" => "1389" "height" => 307 "path" => "/media/himiya_08/gara-zad-8-9/0-2-5/15-1.webp?ts=1738579405" ] ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Element {#1096 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 798121 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1055 #items: array:1 [ 0 => App\Models\Edition {#1093 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 1785 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1092 …2} "field_content_type" => "free" "field_content_mode" => "image" "field_page_content_mode" => "" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Ладыко (Торчило)" "field_moderator" => "vadim" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1090 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1053 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1088 …2} "field_content_source" => null ] #original: array:21 [ "id" => 1785 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1092 …2} "field_content_type" => "free" "field_content_mode" => "image" "field_page_content_mode" => "" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Ладыко (Торчило)" "field_moderator" => "vadim" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1090 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1053 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1088 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "640683" "type" => "task" ] "img" => array:2 [ 0 => array:5 [ "name" => "15-1.png" "alt" => null "width" => "1907" "height" => 543 "path" => "/media/himiya_08/gara-zad-8-9/1-2-5/15-1.webp?ts=1738579460" ] 1 => array:5 [ "name" => "15-2.png" "alt" => null "width" => "1610" "height" => 1036 "path" => "/media/himiya_08/gara-zad-8-9/1-2-5/15-2.webp?ts=1738579460" ] ] ] #original: array:6 [ "id" => 798121 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1055} "task" => array:2 [ "refs" => "640683" "type" => "task" ] "img" => array:2 [ 0 => array:5 [ "name" => "15-1.png" "alt" => null "width" => "1907" "height" => 543 "path" => "/media/himiya_08/gara-zad-8-9/1-2-5/15-1.webp?ts=1738579460" ] 1 => array:5 [ "name" => "15-2.png" "alt" => null "width" => "1610" "height" => 1036 "path" => "/media/himiya_08/gara-zad-8-9/1-2-5/15-2.webp?ts=1738579460" ] ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 2 => App\Models\Element {#1089 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1490962 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1111 #items: array:1 [ 0 => App\Models\Edition {#1052 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 5454 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 2" "field_order" => "3" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1054 …2} "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "2-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1049 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1043 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1041 …2} "field_content_source" => null ] #original: array:21 [ "id" => 5454 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 2" "field_order" => "3" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1054 …2} "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "2-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1049 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1043 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1041 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "640683" "type" => "task" ] "text" => "<p>Данная задача решается на основе предоставленного термохимического уравнения реакции:</p><p>$2\text{Al}(\text{тв}) + \text{Fe}_2\text{O}_3(\text{тв}) = \text{Al}_2\text{O}_3(\text{тв}) + 2\text{Fe}(\text{тв}) + 848 \text{ кДж}$</p><p>Из уравнения следует, что при взаимодействии 2 моль алюминия с 1 моль оксида железа(III) выделяется 848 кДж теплоты.</p><p><strong>Дано:</strong></p><p>а) $m(\text{Al}) = 10,8 \text{ г}$</p><p>б) $\nu(\text{Fe}_2\text{O}_3) = 0,2 \text{ моль}$</p><p>Тепловой эффект реакции: $Q = 848 \text{ кДж}$</p><p>$m(\text{Al}) = 10,8 \text{ г} = 0,0108 \text{ кг}$<br>$Q = 848 \text{ кДж} = 848000 \text{ Дж}$ </p><p><strong>Найти:</strong></p><p>a) $Q_1 - ?$</p><p>б) $Q_2 - ?$</p><p><strong>Решение:</strong></p><p><strong>а)</strong> <strong>1.</strong> Для расчета выделившейся теплоты необходимо сначала определить количество вещества (в молях) алюминия, вступившего в реакцию. Молярная масса алюминия $M(\text{Al})$ составляет примерно $27 \text{ г/моль}$.</p><p>$\nu(\text{Al}) = \frac{m(\text{Al})}{M(\text{Al})} = \frac{10,8 \text{ г}}{27 \text{ г/моль}} = 0,4 \text{ моль}$</p><p><strong>2.</strong> Теперь составим пропорцию, основываясь на данных термохимического уравнения. Согласно уравнению, реакция 2 моль алюминия приводит к выделению 848 кДж теплоты. Рассчитаем, сколько теплоты ($Q_1$) выделится при реакции 0,4 моль алюминия.</p><p>Соотношение:</p><p>$2 \text{ моль Al} \longrightarrow 848 \text{ кДж}$</p><p>$0,4 \text{ моль Al} \longrightarrow Q_1 \text{ кДж}$</p><p>Отсюда находим $Q_1$:</p><p>$Q_1 = \frac{0,4 \text{ моль} \cdot 848 \text{ кДж}}{2 \text{ моль}} = 0,2 \cdot 848 \text{ кДж} = 169,6 \text{ кДж}$</p><p><strong>Ответ:</strong> 169,6 кДж.</p><p><strong>б)</strong> <strong>1.</strong> В этом случае количество вещества оксида железа(III) уже дано в молях. Согласно термохимическому уравнению, при реакции 1 моль оксида железа(III) выделяется 848 кДж теплоты.</p><p><strong>2.</strong> Составим пропорцию для нахождения количества теплоты ($Q_2$), которое выделится при реакции 0,2 моль оксида железа(III).</p><p>Соотношение:</p><p>$1 \text{ моль } \text{Fe}_2\text{O}_3 \longrightarrow 848 \text{ кДж}$</p><p>$0,2 \text{ моль } \text{Fe}_2\text{O}_3 \longrightarrow Q_2 \text{ кДж}$</p><p>Отсюда находим $Q_2$:</p><p>$Q_2 = \frac{0,2 \text{ моль} \cdot 848 \text{ кДж}}{1 \text{ моль}} = 169,6 \text{ кДж}$</p><p><strong>Ответ:</strong> 169,6 кДж.</p>" ] #original: array:6 [ "id" => 1490962 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1111} "task" => array:2 [ "refs" => "640683" "type" => "task" ] "text" => "<p>Данная задача решается на основе предоставленного термохимического уравнения реакции:</p><p>$2\text{Al}(\text{тв}) + \text{Fe}_2\text{O}_3(\text{тв}) = \text{Al}_2\text{O}_3(\text{тв}) + 2\text{Fe}(\text{тв}) + 848 \text{ кДж}$</p><p>Из уравнения следует, что при взаимодействии 2 моль алюминия с 1 моль оксида железа(III) выделяется 848 кДж теплоты.</p><p><strong>Дано:</strong></p><p>а) $m(\text{Al}) = 10,8 \text{ г}$</p><p>б) $\nu(\text{Fe}_2\text{O}_3) = 0,2 \text{ моль}$</p><p>Тепловой эффект реакции: $Q = 848 \text{ кДж}$</p><p>$m(\text{Al}) = 10,8 \text{ г} = 0,0108 \text{ кг}$<br>$Q = 848 \text{ кДж} = 848000 \text{ Дж}$ </p><p><strong>Найти:</strong></p><p>a) $Q_1 - ?$</p><p>б) $Q_2 - ?$</p><p><strong>Решение:</strong></p><p><strong>а)</strong> <strong>1.</strong> Для расчета выделившейся теплоты необходимо сначала определить количество вещества (в молях) алюминия, вступившего в реакцию. Молярная масса алюминия $M(\text{Al})$ составляет примерно $27 \text{ г/моль}$.</p><p>$\nu(\text{Al}) = \frac{m(\text{Al})}{M(\text{Al})} = \frac{10,8 \text{ г}}{27 \text{ г/моль}} = 0,4 \text{ моль}$</p><p><strong>2.</strong> Теперь составим пропорцию, основываясь на данных термохимического уравнения. Согласно уравнению, реакция 2 моль алюминия приводит к выделению 848 кДж теплоты. Рассчитаем, сколько теплоты ($Q_1$) выделится при реакции 0,4 моль алюминия.</p><p>Соотношение:</p><p>$2 \text{ моль Al} \longrightarrow 848 \text{ кДж}$</p><p>$0,4 \text{ моль Al} \longrightarrow Q_1 \text{ кДж}$</p><p>Отсюда находим $Q_1$:</p><p>$Q_1 = \frac{0,4 \text{ моль} \cdot 848 \text{ кДж}}{2 \text{ моль}} = 0,2 \cdot 848 \text{ кДж} = 169,6 \text{ кДж}$</p><p><strong>Ответ:</strong> 169,6 кДж.</p><p><strong>б)</strong> <strong>1.</strong> В этом случае количество вещества оксида железа(III) уже дано в молях. Согласно термохимическому уравнению, при реакции 1 моль оксида железа(III) выделяется 848 кДж теплоты.</p><p><strong>2.</strong> Составим пропорцию для нахождения количества теплоты ($Q_2$), которое выделится при реакции 0,2 моль оксида железа(III).</p><p>Соотношение:</p><p>$1 \text{ моль } \text{Fe}_2\text{O}_3 \longrightarrow 848 \text{ кДж}$</p><p>$0,2 \text{ моль } \text{Fe}_2\text{O}_3 \longrightarrow Q_2 \text{ кДж}$</p><p>Отсюда находим $Q_2$:</p><p>$Q_2 = \frac{0,2 \text{ моль} \cdot 848 \text{ кДж}}{1 \text{ моль}} = 169,6 \text{ кДж}$</p><p><strong>Ответ:</strong> 169,6 кДж.</p>" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "640684" "type" => "task" ] "previous" => array:2 [ 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=> null "edition" => Illuminate\Database\Eloquent\Collection {#1132 …2} "book_page" => array:2 [ …2] "img" => array:1 [ …1] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "923257" "type" => "book_page" ] "previous" => array:2 [ "refs" => "923255" "type" => "book_page" ] "tasks" => Illuminate\Database\Eloquent\Collection {#1203 #items: array:10 [ 0 => App\Models\Task {#1219 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640682 "created_at" => "2026-04-10 13:58:26" "updated_at" 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"field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-14" "field_display_title" => "5.14" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1220 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1221 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1222 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1223 …2} "content" => Illuminate\Database\Eloquent\Collection {#1226 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1232 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Task {#1225 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640683 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-15" "field_display_title" => "5.15" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1224 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1231 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1233 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1229 …2} "content" => Illuminate\Database\Eloquent\Collection {#1227 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1230 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 640683 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-15" "field_display_title" => "5.15" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1224 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1231 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1233 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#guarded: array:1 [ 0 => "*" ] } 3 => App\Models\Task {#1246 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640685 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-17" "field_display_title" => "5.17" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1245 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1252 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1254 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1250 …2} "content" => Illuminate\Database\Eloquent\Collection {#1249 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1267 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 640685 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-17" "field_display_title" => "5.17" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1245 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1252 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1254 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1250 …2} "content" => Illuminate\Database\Eloquent\Collection {#1249 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1267 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 4 => App\Models\Task {#1251 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640686 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-18" "field_display_title" => "5.18" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1248 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1266 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1268 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1264 …2} "content" => Illuminate\Database\Eloquent\Collection {#1263 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1281 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 640686 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-18" "field_display_title" => "5.18" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1248 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1266 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1268 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1264 …2} "content" => Illuminate\Database\Eloquent\Collection {#1263 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1281 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 5 => App\Models\Task {#1265 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640687 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-19" "field_display_title" => "5.19" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1262 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1280 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1282 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1278 …2} "content" => Illuminate\Database\Eloquent\Collection {#1277 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1295 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 640687 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-19" "field_display_title" => "5.19" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1262 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1280 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1282 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1278 …2} "content" => Illuminate\Database\Eloquent\Collection {#1277 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1295 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 6 => App\Models\Task {#1279 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640688 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-20" "field_display_title" => "5.20" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1276 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1294 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1296 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1292 …2} "content" => Illuminate\Database\Eloquent\Collection {#1291 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1309 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 640688 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-20" "field_display_title" => "5.20" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1276 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1294 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1296 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1292 …2} "content" => Illuminate\Database\Eloquent\Collection {#1291 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1309 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 7 => App\Models\Task {#1293 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640689 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-21" "field_display_title" => "5.21" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1290 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1308 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1310 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1306 …2} "content" => Illuminate\Database\Eloquent\Collection {#1305 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1323 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 640689 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-21" "field_display_title" => "5.21" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1290 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1308 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1310 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1306 …2} "content" => Illuminate\Database\Eloquent\Collection {#1305 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1323 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 8 => App\Models\Task {#1307 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640690 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-22" "field_display_title" => "5.22" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1304 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1322 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1324 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1320 …2} "content" => Illuminate\Database\Eloquent\Collection {#1319 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1337 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 640690 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-22" "field_display_title" => "5.22" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1304 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1322 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1324 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1320 …2} "content" => Illuminate\Database\Eloquent\Collection {#1319 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1337 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 9 => App\Models\Task {#1321 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 640691 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "70" "field_page_end" => null "field_url" => "/8-klass/himiya/gara-zadachnik/2-5-23" "field_display_title" => "5.23" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1318 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1336 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1338 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1334 …2} "content" => Illuminate\Database\Eloquent\Collection {#1333 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1351 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№5.15 (с. 70)
Условие. №5.15 (с. 70)
скриншот условия
5.15. По термохимическому уравнению реакции
$2\text{Al}(\text{тв}) + \text{Fe}_2\text{O}_3(\text{тв}) = \text{Al}_2\text{O}_3(\text{тв}) + 2\text{Fe}(\text{тв}) + 848 \text{ кДж}$
рассчитайте, сколько выделится теплоты при вступлении в реакцию:
а) 10,8 г алюминия;
б) 0,2 моль оксида железа(III).
Решение. №5.15 (с. 70)
Решение 2. №5.15 (с. 70)
Данная задача решается на основе предоставленного термохимического уравнения реакции:
$2\text{Al}(\text{тв}) + \text{Fe}_2\text{O}_3(\text{тв}) = \text{Al}_2\text{O}_3(\text{тв}) + 2\text{Fe}(\text{тв}) + 848 \text{ кДж}$
Из уравнения следует, что при взаимодействии 2 моль алюминия с 1 моль оксида железа(III) выделяется 848 кДж теплоты.
Дано:
а) $m(\text{Al}) = 10,8 \text{ г}$
б) $\nu(\text{Fe}_2\text{O}_3) = 0,2 \text{ моль}$
Тепловой эффект реакции: $Q = 848 \text{ кДж}$
$m(\text{Al}) = 10,8 \text{ г} = 0,0108 \text{ кг}$
$Q = 848 \text{ кДж} = 848000 \text{ Дж}$
Найти:
a) $Q_1 - ?$
б) $Q_2 - ?$
Решение:
а) 1. Для расчета выделившейся теплоты необходимо сначала определить количество вещества (в молях) алюминия, вступившего в реакцию. Молярная масса алюминия $M(\text{Al})$ составляет примерно $27 \text{ г/моль}$.
$\nu(\text{Al}) = \frac{m(\text{Al})}{M(\text{Al})} = \frac{10,8 \text{ г}}{27 \text{ г/моль}} = 0,4 \text{ моль}$
2. Теперь составим пропорцию, основываясь на данных термохимического уравнения. Согласно уравнению, реакция 2 моль алюминия приводит к выделению 848 кДж теплоты. Рассчитаем, сколько теплоты ($Q_1$) выделится при реакции 0,4 моль алюминия.
Соотношение:
$2 \text{ моль Al} \longrightarrow 848 \text{ кДж}$
$0,4 \text{ моль Al} \longrightarrow Q_1 \text{ кДж}$
Отсюда находим $Q_1$:
$Q_1 = \frac{0,4 \text{ моль} \cdot 848 \text{ кДж}}{2 \text{ моль}} = 0,2 \cdot 848 \text{ кДж} = 169,6 \text{ кДж}$
Ответ: 169,6 кДж.
б) 1. В этом случае количество вещества оксида железа(III) уже дано в молях. Согласно термохимическому уравнению, при реакции 1 моль оксида железа(III) выделяется 848 кДж теплоты.
2. Составим пропорцию для нахождения количества теплоты ($Q_2$), которое выделится при реакции 0,2 моль оксида железа(III).
Соотношение:
$1 \text{ моль } \text{Fe}_2\text{O}_3 \longrightarrow 848 \text{ кДж}$
$0,2 \text{ моль } \text{Fe}_2\text{O}_3 \longrightarrow Q_2 \text{ кДж}$
Отсюда находим $Q_2$:
$Q_2 = \frac{0,2 \text{ моль} \cdot 848 \text{ кДж}}{1 \text{ моль}} = 169,6 \text{ кДж}$
Ответ: 169,6 кДж.
Другие задания:
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