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Консультация № 109478
15.11.2007, 05:44
0.00 руб.
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здравствуйте. помогите решить следующую задачу: рассчитайте концентрацию раствора полученного смешиванием 80гр. 15% раствора с 120 гр. воды
Обсуждение
Неизвестный
15.11.2007, 06:43
общий
это ответ
Здравствуйте, Козырев Сергей Андреевич!
15%=m(в-ва)/m(р-ра)*100%
m(в-ва)/80г=0,15 m(в-ва)=12г
Добавляя воду мы не увеличиваем массу в-ва в растворе, а только увеличиваем массу раствора
m2(р-ра)=80г+120г=200г
m2(в-ва)=m(в-ва)=12г
массовая доля растворенного в-ва = 12г/200г*100%=6%
15%=m(в-ва)/m(р-ра)*100%
m(в-ва)/80г=0,15 m(в-ва)=12г
Добавляя воду мы не увеличиваем массу в-ва в растворе, а только увеличиваем массу раствора
m2(р-ра)=80г+120г=200г
m2(в-ва)=m(в-ва)=12г
массовая доля растворенного в-ва = 12г/200г*100%=6%
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