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Консультация № 189388
16.05.2016, 22:45
0.00 руб.
0
3
1
Здравствуйте! У меня возникли сложности с таким вопросом:
Вычислите молярную концентрацию и молярную концентрацию эквивалента раствора хлорида алюминия с массовой долей AlCl3 16% и плотностью
1,149 г/мл.
Вычислите молярную концентрацию и молярную концентрацию эквивалента раствора хлорида алюминия с массовой долей AlCl3 16% и плотностью
1,149 г/мл.
Обсуждение
18.05.2016, 13:29
общий
ищем массу раствора V=1000 мл, она равна 1,149*1000=1149г, в нем масса AlCl3
m=0,16*1149=183,8 г
n=m/Mr=183,8/133,5=1,38 моль => См=1,38 моль/л
С (1/z)=С (1/3)=3*1,38=4,1 моль-экв/л
моляльность-число молей в 1 кг растворителя, расчет ведут на 1кг раствора
здесь 16% раствор, m(AlCL3)=160г, тогда масса воды 1000-160=840г
Сm=n/m (Н2о)
n=m/Mr=160/133,5=1,2 моль
Cm=1,2/0,84=1,43 моль/кг
m=0,16*1149=183,8 г
n=m/Mr=183,8/133,5=1,38 моль => См=1,38 моль/л
С (1/z)=С (1/3)=3*1,38=4,1 моль-экв/л
моляльность-число молей в 1 кг растворителя, расчет ведут на 1кг раствора
здесь 16% раствор, m(AlCL3)=160г, тогда масса воды 1000-160=840г
Сm=n/m (Н2о)
n=m/Mr=160/133,5=1,2 моль
Cm=1,2/0,84=1,43 моль/кг
20.05.2016, 22:05
общий
Адресаты:
Пожалуйста, отправьте Ваш ответ через форму отправки ответа (под вопросом должна быть ссылка "ответить")
26.05.2016, 20:24
общий
это ответ
Здравствуйте, line-di!
Ответ от эксперта tehnolog (перенесён из мини-форума):
ищем массу раствора V=1000 мл, она равна 1,149*1000=1149г, в нем масса AlCl3
m=0,16*1149=183,8 г
n=m/Mr=183,8/133,5=1,38 моль => См=1,38 моль/л
С (1/z)=С (1/3)=3*1,38=4,1 моль-экв/л
моляльность-число молей в 1 кг растворителя, расчет ведут на 1кг раствора
здесь 16% раствор, m(AlCl3)=160г, тогда масса воды 1000-160=840г
Сm=n/m(Н2O)
n=m/Mr=160/133,5=1,2 моль
Cm=1,2/0,84=1,43 моль/кг
Ответ от эксперта tehnolog (перенесён из мини-форума):
ищем массу раствора V=1000 мл, она равна 1,149*1000=1149г, в нем масса AlCl3
m=0,16*1149=183,8 г
n=m/Mr=183,8/133,5=1,38 моль => См=1,38 моль/л
С (1/z)=С (1/3)=3*1,38=4,1 моль-экв/л
моляльность-число молей в 1 кг растворителя, расчет ведут на 1кг раствора
здесь 16% раствор, m(AlCl3)=160г, тогда масса воды 1000-160=840г
Сm=n/m(Н2O)
n=m/Mr=160/133,5=1,2 моль
Cm=1,2/0,84=1,43 моль/кг
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