Задачи на выход реакции!!!

[helltop]

Подскажите как решать задачи на выход реакции. И как найти массу практического вещества и теоретического.
Пример задачи.
При взаимодействии этанола массой 9,2 г с оксидом меди(II) массой 20 г получится альдегид массой 7,04 г Определите выход реакции. И помогите составить реакцию. Заранее Спасибо!

[Руслан Бешкетиров]

Решение простое:
C2H5OH + CuO = CH3COH + H2O + Cu

1) находим хим. колич. этанола:
9,2 / 46 = 0,2 моль

2) находим химич. колич. CuO и убежд., что его достат.:
20 / 64 = 0,3125 моль, что больше, чем 0,2 моль

3) находим расч. колич. ацетальдегида:
0,2 * 44 = 8,8 г

4) находим выход, сопост. теоретич. и практич. результат:
7,04 / 8,8 * 100 = 80 %

[helltop]

Большое Спасибо! накрнец хоть кто то ответил. еще раз спасибо!

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