До 200г 40% розчину глюкози додали 300г води. Масова частка глюкози в новому розчині становить:
а) 8%; б) 16%; в) 20%; г) 32%.
С решением

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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