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Консультация № 175435
19.12.2009, 18:16
0.00 руб.
0
7
1
Привет. Вот такая задача:
Какая масса соли тетрааммина меди(II) получится при взаимодействии 10г сульфата меди CuSO4*5H2O с 0,2л раствора аммиака, в котором массовая доля аммиака равна 20%, а плотность этого раствора равна 923 кг/м3?
Решала так:
Искомая масса равна масса сульфата+масса аммиака-масса воды
масса воды равна 10/250 *18=36гр
искомая масса=10+0,2*0,2*923-36=10,92
В ответе 9,84гр. Не сходится. В чем ошибка?
Какая масса соли тетрааммина меди(II) получится при взаимодействии 10г сульфата меди CuSO4*5H2O с 0,2л раствора аммиака, в котором массовая доля аммиака равна 20%, а плотность этого раствора равна 923 кг/м3?
Решала так:
Искомая масса равна масса сульфата+масса аммиака-масса воды
масса воды равна 10/250 *18=36гр
искомая масса=10+0,2*0,2*923-36=10,92
В ответе 9,84гр. Не сходится. В чем ошибка?
Обсуждение
Неизвестный
19.12.2009, 20:01
общий
Извините. Точно все верно. Задачц решил, но у меня получилось 9,12 г
Неизвестный
19.12.2009, 20:04
общий
смотрела 3 раза (внимательно!!!) ответ 9,84. а можно посмотреть ваше реш?
Неизвестный
19.12.2009, 20:06
общий
Я еще подумаю. Порешаю. Потом оформлю, но не сегодня. Поздновато уже.
Неизвестный
19.12.2009, 20:51
общий
это ответ
Здравствуйте, Кузьмина Ирина Владимировна.
Ошибка в том, что вы не учли того, что какое-то из веществ может быть в избытке. Вы просто предположили, что из кристаллогидрата уйдет вся вода, а на ее место придут все молекулы аммиака (а не 4 моль аммиака на 1 моль кристаллогидрата)
Найдем количество вещества аммиака = 200мл*0.923г/мл*20%/100% / (17 г/моль) = 2.17 моль
А количество вещества CuSO4*5H2O = 10г/250(г/моль) = 0.04 моль
Следовательно на образование соли тетраамминмеди(II) пойдет 0.04моль*4=0.16моль (аммиак находится в избытке)
Теперь найдем массу образовавшейся соли исходя из количества вещества (0.04моль) и молярной массы (246г/моль - [Cu(NH3)4]SO4[$149$]H2O
m=0.04*246г = 9.84г
Кроме того, вы неправильно нашли массу воды: масса воды в кристаллогидрате у вас больше, чем масса самого кристаллогидрата.
Ошибка в том, что вы не учли того, что какое-то из веществ может быть в избытке. Вы просто предположили, что из кристаллогидрата уйдет вся вода, а на ее место придут все молекулы аммиака (а не 4 моль аммиака на 1 моль кристаллогидрата)
Найдем количество вещества аммиака = 200мл*0.923г/мл*20%/100% / (17 г/моль) = 2.17 моль
А количество вещества CuSO4*5H2O = 10г/250(г/моль) = 0.04 моль
Следовательно на образование соли тетраамминмеди(II) пойдет 0.04моль*4=0.16моль (аммиак находится в избытке)
Теперь найдем массу образовавшейся соли исходя из количества вещества (0.04моль) и молярной массы (246г/моль - [Cu(NH3)4]SO4[$149$]H2O
m=0.04*246г = 9.84г
Кроме того, вы неправильно нашли массу воды: масса воды в кристаллогидрате у вас больше, чем масса самого кристаллогидрата.
5
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