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Консультация № 184613
29.11.2011, 19:53
65.00 руб.
0
3
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос: Сколько граммов КВr необходимо растворить в 400 мл воды, чтобы
получить 0,1 М раствор?
получить 0,1 М раствор?
Обсуждение
Неизвестный
29.11.2011, 20:21
общий
V (H2O)= 0,4 л
С(КВr)= n(КВr)/V (H2O)
n(КВr)= С(КВr)*V (H2O)
n(КВr)= 0,1 моль/л *0,4 л=0,04 моль
m(КВr)= n(КВr)* М(КВr); М(КВr)= 119 г/моль
m(КВr)=0,04моль * 119 г/моль= 4,76 г
Ответ: m(КВr)=4,76 г
С(КВr)= n(КВr)/V (H2O)
n(КВr)= С(КВr)*V (H2O)
n(КВr)= 0,1 моль/л *0,4 л=0,04 моль
m(КВr)= n(КВr)* М(КВr); М(КВr)= 119 г/моль
m(КВr)=0,04моль * 119 г/моль= 4,76 г
Ответ: m(КВr)=4,76 г
Форма ответа
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