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Консультация № 181645
27.12.2010, 16:52
50.00 руб.
0
1
1
Здравствуйте, уважаемые эксперты! Прошу Вас ответить на следующий вопрос:
При растворении 2,3 г некоторого неэлектролита в 125 г воды температура кристаллизации понижается на 0,372[$186$]. Вычислите молярную массу растворенного вещества. Криоскопическая константа воды равна 1,86[$186$]
При растворении 2,3 г некоторого неэлектролита в 125 г воды температура кристаллизации понижается на 0,372[$186$]. Вычислите молярную массу растворенного вещества. Криоскопическая константа воды равна 1,86[$186$]
Обсуждение
27.12.2010, 23:37
общий
это ответ
Здравствуйте, Botsman!
m(H2O)=125 г
m=2,3 г
[$916$]tкр=0,372 [$176$]С
Ккр=1,86 [$176$]С[$183$]кг/моль
По определению криоскопической константы
[$916$]tкр=Ккр[$183$]n/m(H2O)
Выражаем количество вещества (т. к. вещество является неэлектролитом, количество его частиц в растворе будет равна количеству растворённого вещества)
n=[$916$]tкр[$183$]m(H2O)/Ккр=0,372[$176$]С[$183$]0,125кг/1,86[$176$]С[$183$]кг/моль=0,025 моль
Отсюда молярная масса растворённого вещества M=m/n=2,3г/0,025моль=92 г/моль
m(H2O)=125 г
m=2,3 г
[$916$]tкр=0,372 [$176$]С
Ккр=1,86 [$176$]С[$183$]кг/моль
По определению криоскопической константы
[$916$]tкр=Ккр[$183$]n/m(H2O)
Выражаем количество вещества (т. к. вещество является неэлектролитом, количество его частиц в растворе будет равна количеству растворённого вещества)
n=[$916$]tкр[$183$]m(H2O)/Ккр=0,372[$176$]С[$183$]0,125кг/1,86[$176$]С[$183$]кг/моль=0,025 моль
Отсюда молярная масса растворённого вещества M=m/n=2,3г/0,025моль=92 г/моль
5
Спасибо!
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