Предмет: Химия, автор: moto15

Вычислите массовые доли элелементов в оксиде лития! Помогите пожалуйста

Ответы

Автор ответа: Сестрорецк1714

Оксид лития имеет формулу Li2O. Атомные массы лития и кислорода равны 7 и 16 соответственно. Найдём молярную массу вещества: 7*2+16= 30 г/моль. Теперь нужно поделить атомную массу каждого элемента на молярную массу вещества. Следовательно,

7*2/30 = 0,47 (47%) -- массовая доля лития
16/30 = 0,53 (53%) -- массовая доля кислорода.
Ответ: 47%, 53%.

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