Предмет: Химия, автор: Белочка1111

привет всем , помогите пожалуйста решить задачу по химии за 8 класс. Сколько молей оксида кальция получится при взаимодействии кальция с 5,6 литрами кислорода (при н.у )

Ответы

Автор ответа: Yumiтян

2Ca+O2=2CaO
Молекулярная масса кислорода:22,4 литра
Молекулярная масса оксида кальция:16*2+40*2=112 гр.
Составим пропорцию:
5,6 - х
22,4 - 112
х=5,6*112/22,4=627,2/22,4=28 гр.
Это мы вычислили массу оксида кальция, теперь нам надо найти, собственно, количество молей оксида кальция.
Это вычисляется по формуле:
n=m/M, где n-кол-во молей,m-масса вещества,а M-молекулярная масса вещества.
Принимаем кол-во молей за х и ищем:
х=28/112=0,25 моль.
Ответ:0,25

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