Предмет: Химия, автор: Alena121312

Кто поможет решить? ! При растворении в H2SO4 10,48 г смеси оксидов CuO и ZnO образовалось 20,88 г смеси безводных сульфатов CuSO4 и ZnSO4. Определите состав взятой смеси.

Ответы

Автор ответа: Аноним

1) Ур-ия р-ий обр-ия сульфатов: а) CuO (M = 80 г/моль) + H2SO4 = CuSO4 (М = 160 г/моль) + H2O и б) ZnO (M = 81 г/моль) + H2SO4 = ZnSO4 (M = 161 г/моль) + H2O; из х г CuO обр-ся 160/80 = 2*х г CuSO4, а из 10.48-х г ZnO - соот-но (10.48-х)*161/81 = 1.98765432*(10.48-х) г ZnSO4, что в сумме дает 2*х+1.98765432*(10.48-х) = 20.88, откуда х = 4 г CuO и 10.48-4 = 6.48 г ZnO.

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