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Консультация № 173713
26.10.2009, 19:41
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Уважаемые эксперты помогите плз красивой но глупенькой девушке!Через раствор сульфата меди (II) пропустили сероводород объемом 2,8 л (н.у.). При этом образовался осадок массой 11,4 г. Рассчитайте массовую долю выхода малорастворимого продукта реакции.Заранее спасибо 
Обсуждение
Неизвестный
27.10.2009, 00:31
общий
это ответ
Здравствуйте, Киселева Мария Александровна.
Запишем реакцию
CuSO4 + H2S = CuS + H2SO4
Теоретически, если весь сероводород прореагирует, то получится масса сульфида меди = 2,8л/22.4(л/моль) * (64+32)г/моль = 12г
А на практике получилось 11.4г
Выход = 11.4г / 12г *100% = 95%
Запишем реакцию
CuSO4 + H2S = CuS + H2SO4
Теоретически, если весь сероводород прореагирует, то получится масса сульфида меди = 2,8л/22.4(л/моль) * (64+32)г/моль = 12г
А на практике получилось 11.4г
Выход = 11.4г / 12г *100% = 95%
5
спасибо большое<br>решите если не сложно еще 1
Неизвестный
27.10.2009, 00:31
общий
27.10.2009, 00:41
это ответ
Здравствуйте, Киселева Мария Александровна.
Отвечаю на первый Ваш вопрос:
решение следующее:
согласно уравнению реакции CuSO4+H2S=CuS+H2SO4 видно, что на 1 моль H2S приходится 1 моль CuS. Тогда найдем кол-во вещества (моль)H2S:
кол-во вещества (моль)H2S=кол-во вещества (моль)CuS=2,8 л/22,4 л (знаменатель - молярный объем газа)= 0,125 моль. Далее находим, сколько теоретически должен быть выход: m(теор.)=кол-во вещества (моль)CuS*М(молярная масса, г/моль)CuS=0, 125*96=12 г.
Тогда ОТВЕТ: выход практический к теоретическому = 11,4/12*100%= 95%
Отвечаю на первый Ваш вопрос:
решение следующее:
согласно уравнению реакции CuSO4+H2S=CuS+H2SO4 видно, что на 1 моль H2S приходится 1 моль CuS. Тогда найдем кол-во вещества (моль)H2S:
кол-во вещества (моль)H2S=кол-во вещества (моль)CuS=2,8 л/22,4 л (знаменатель - молярный объем газа)= 0,125 моль. Далее находим, сколько теоретически должен быть выход: m(теор.)=кол-во вещества (моль)CuS*М(молярная масса, г/моль)CuS=0, 125*96=12 г.
Тогда ОТВЕТ: выход практический к теоретическому = 11,4/12*100%= 95%
5
спс решите еще если не сложно
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