Предмет: Химия, автор: andandryshaaa

Обчислити масу осаду, утвореного внаслідок взаємодії 624 г барій хлориду та 684 г алюміній сульфату

Ответы

Автор ответа: dyexfnf
1

Ответ:

Объяснение:

684 г               624 г                        х г

Al2(SO4)3 + 3BaCl2 = 2AlCl3 + 3BaSO4↓

Вичислимо молярні маси:

M (AI2(SO4)3) = 27 * 2 + 32 * 3 + 16 * 12 = 342 г/моль

M(BaCl2) = 137 + 2 * 35,5 = 208 г/моль

Знайдемо кількість речовини реагентів:

n(Al2(SO4)3) = m(Al2(SO4)3)/М(Al2(SO4)3) = 684/342 = 2 моль

n(BaCl2) = m(BaCl2)/М(BaCl2) = 624/208 = 3 моль

З РХР бачимо, що n(Al2(SO4)3) : n(BaCl2) = 1 : 3, а з умовиn(Al2(SO4)3) : n(BaCl2) = 2 : 3 = 1 : 1,5 , тобто BaCl2 в надлишку, розрахунок ведемо по Al2(SO4)3 і звідси

n(BaSO4) = n(Al2(SO4)3) = 3 моль

Обчислимо масу осаду:

М(BaSO4) = 137 + 32 + 16 * 4 = 233 г/моль

m(BaSO4)= n(BaSO4) * М(BaSO4) = 3 * 233 = 699 г

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