Предмет: Химия, автор: Аноним

Какая масса карбида алюминия может быть получена при прокаливании 3, 6 г. углерода с алюминием , если выход реакции составляет 90%?

Ответы

Автор ответа: Kodeum

1.4Al + 3C = Al4C3
2.Найдём кол-во в-ва углерода по формуле:к-во в-ва=масса в-ва/молярная масса в-ва.Получили 0,1 моль
3.Теперь найдём количество в-ва для карбида алюминия.Для этого 0,1 разделим на три(т.к коэффициент перед углеродом равен трём).Получили о,03 моль.
4.Теперь,чтобы узнать массу карбида,нужно умножить количество в-ва на молярную массу и умножить на 0,9(чтобы вычислить массу практического выхода):0,03*144=4,32 грамма;4,32*0,9=3,888 грамма
Ответ:3,888 грамма

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