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Консультация № 187726
29.01.2014, 20:21
99.00 руб.
0
1
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Кремний высокой чистоты получают восстановлением SiCl4 парами цинка при высокой температуре. При этом образуются кремний и хлорид цинка. Составьте уравнение этой реакции и рассчитайте массу SiСl4, который должен прореагировать с цинком, чтобы образовалось 560г. кремния. (Ответ : 3.4 кг)
Кремний высокой чистоты получают восстановлением SiCl4 парами цинка при высокой температуре. При этом образуются кремний и хлорид цинка. Составьте уравнение этой реакции и рассчитайте массу SiСl4, который должен прореагировать с цинком, чтобы образовалось 560г. кремния. (Ответ : 3.4 кг)
Обсуждение
30.01.2014, 10:59
общий
это ответ
Здравствуйте, Stas Shev!
Решение.
Атомная масса кремния 28, хлора 35.5. Уравнение реакции: SiCl[sub]4[/sub] + 2Zn = Si + 2ZnCl[sub]2[/sub]. Из одной граммолекулы SiCl[sub]4[/sub] выходит один грамматом Si. Требуется получить 560/28 = 20 грамматомов Si, на что уйдёт 20 граммолекул SiCl[sub]4[/sub]. Молярная масса SiCl[sub]4[/sub]: 28 + 4*35.5 = 170. Масса 20-ти граммолекул SiCl[sub]4[/sub]: 20*170 = 3400 г или 3.4 кг.
Решение.
Атомная масса кремния 28, хлора 35.5. Уравнение реакции: SiCl[sub]4[/sub] + 2Zn = Si + 2ZnCl[sub]2[/sub]. Из одной граммолекулы SiCl[sub]4[/sub] выходит один грамматом Si. Требуется получить 560/28 = 20 грамматомов Si, на что уйдёт 20 граммолекул SiCl[sub]4[/sub]. Молярная масса SiCl[sub]4[/sub]: 28 + 4*35.5 = 170. Масса 20-ти граммолекул SiCl[sub]4[/sub]: 20*170 = 3400 г или 3.4 кг.
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