Составьте формулы оксидов для следующих элементов. Если валентность элемента не указана – считайте её высшей.

Селен (II); магний; железо (III); азот (I); бериллий; алюминий;

литий; галлий; йод; марганец.

2. Решите задачу:

Реакция протекает по уравнению:

2KClO3 = 2KCl + 3O2 – 91 кДж,

Вычислите массу образовавшихся KCl и O2, если в ходе реакции было затрачено 728 кДж.​

CIVII20II7

Объяснение:

определим валентность хлора в его соединении с кислородом — Cl2O7.

1. Записываем известную валентность кислорода над формулой. Неизвестную валентность обозначаем буквой x:

Clx2OII7.

2. Находим сумму единиц валентности каждого элемента. Для этого его валентность умножаем на число атомов:

x⋅2=2⋅7.

3. Вычисляем x:

2x=14,x=14:2=7.

Валентность хлора равна VII:

ClVII2OII7.

Составление формулы бинарного соединения по валентностям химических элементов

Если известны валентности двух элементов, то можно составить формулу их соединения.

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