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задачи на массовую долю

Какова будет массовая доля вещества в растворе, полученном смешением 300г 25%-ного и 200г 16%-ного растворов некоторого вещества? Ответ: 21,4.
К 170 г 20 %-ного раствора бромида магния прибавлено 330 г воды. Вычислите массовую долю бромида магния в получившемся растворе. Ответ: 6,8.
Смешали 80г раствора с массовой долей нитрата натрия 25% и 20г раствора этой же соли с массовой долей 40 %. Вычислите массовую долю соли в полученном растворе. Ответ дайте в процентах с точностью до целых. Ответ: 28%
Какую массу соли можно получить, если выпарить 500 кг морской воды, если известно, что в морской воде содержится 3,6 % соли по массе? Ответ: 18 кг.
К 90г раствора с массовой долей хлорида магния 10% добавили 39мл воды и 21г этой же соли. Определите массовую долю соли в полученном растворе. Ответ: 20%.
К 200г баритовой воды добавили избыток раствора карбоната натрия, выпал осадок массой 8,9г. Определите массовую долю гидроксида бария в исходном растворе. Ответ: 3,85 %.
Created by: Meshalkina



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