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Консультация № 158458
22.01.2009, 18:06
50.00 руб.
0
2
1
Здравствуйте, уважаемые эксперты, помогите, пожалуйста: Какую массу анилина C6H5NH2 следует растворить в 50 г этилового эфира, чтобы температура кипения раствора была выше температуры кипения этилового эфира на 0,53о. Эбулиоскопическая константа этилового эфира 2,12о.
Ответ: 1,16 г.
Ответ: 1,16 г.
Обсуждение
Неизвестный
22.01.2009, 19:09
общий
это ответ
Здравствуйте, Рыбальченко Ярослав Павлович!
Эбулиоскопическая константа - это число градусов, на которое повышается температура кипения раствора при растворении 1 моль растворенного вещества в 1 кг растворителя.
[$916$]T = nE, где n - моляльность раствора(число моль растворенного вещества на 1000 г чистого растворителя), Е - эбулиоскопическая константа.
0.53 = n * 2.12
n = 0.53/2.12 = 0.25 моль/(1000 г растворителя)
v = 0.25 моль/(1000 г) * 50 г = 0.0125 моль.
m = 0.0125 моль * 93 г/моль = 1.1625 г.(то есть, практически точно Ваш ответ)
С уважением, Товарищ Бородин
Эбулиоскопическая константа - это число градусов, на которое повышается температура кипения раствора при растворении 1 моль растворенного вещества в 1 кг растворителя.
[$916$]T = nE, где n - моляльность раствора(число моль растворенного вещества на 1000 г чистого растворителя), Е - эбулиоскопическая константа.
0.53 = n * 2.12
n = 0.53/2.12 = 0.25 моль/(1000 г растворителя)
v = 0.25 моль/(1000 г) * 50 г = 0.0125 моль.
m = 0.0125 моль * 93 г/моль = 1.1625 г.(то есть, практически точно Ваш ответ)
С уважением, Товарищ Бородин
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