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Консультация № 190010
12.11.2016, 12:23
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Сколько граммов хлорида натрия необходимо для приготовления 400 г
раствора молярной концентрации 5,7 моль/л? Плотность раствора 1,17 г/мл.
Скажите, сколько мл 0,5-молярного раствора нитрата серебра требуется для образования хлорида серебра из 400 г исходного раствора хлорида натрия?
Правильно ли решение:
Vp = m/пл-ть = 400 г/1.17 г/мл = 342 мл
рассчитаем кол-во моли NaCl в 400 гр 5.7 моль/л раствора:
Ср * V = 5,7 моль/л * 0,342 л = 2 моль
чтоб найти mNaCl надо кол-во моли умножить на молярную массы = 2 моль * 58,44 г/моль = 117 г
Ответ m = 117 гр
Над вторым вопросом еще думаю
Сколько граммов хлорида натрия необходимо для приготовления 400 г
раствора молярной концентрации 5,7 моль/л? Плотность раствора 1,17 г/мл.
Скажите, сколько мл 0,5-молярного раствора нитрата серебра требуется для образования хлорида серебра из 400 г исходного раствора хлорида натрия?
Правильно ли решение:
Vp = m/пл-ть = 400 г/1.17 г/мл = 342 мл
рассчитаем кол-во моли NaCl в 400 гр 5.7 моль/л раствора:
Ср * V = 5,7 моль/л * 0,342 л = 2 моль
чтоб найти mNaCl надо кол-во моли умножить на молярную массы = 2 моль * 58,44 г/моль = 117 г
Ответ m = 117 гр
Над вторым вопросом еще думаю
Обсуждение
12.11.2016, 22:32
общий
Адресаты:
Ход решения у Вас верный, но с округлением нужно поаккуратнее.
Для промежуточных результатов важно, чтобы погрешность округления была не выше (а желательно - существенно ниже, чтобы не вносить дополнительные ошибки), чем у исходных данных.
Поэтому количество вещества стоит округлить до 1,95 моль и масса соли получается 114 г
Для промежуточных результатов важно, чтобы погрешность округления была не выше (а желательно - существенно ниже, чтобы не вносить дополнительные ошибки), чем у исходных данных.
Поэтому количество вещества стоит округлить до 1,95 моль и масса соли получается 114 г
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