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Консультация № 69034
29.12.2006, 13:00
0.00 руб.
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Здравствуйте. Помогите решить задачу: при сжигании углеводорода массой 8,6 г. образуется 26,4 г. углекислого газа и 12,6г. воды плотностью 3,84 г/л. Определить молекулярную формулу и указать класс веществ.
Обсуждение
Неизвестный
29.12.2006, 15:00
общий
это ответ
Здравствуйте, BCK!
Не совсем понятно, к чему тут плотность - к воде, что ли? По-моему, дана плотность углеводорода.
Обозначим искомый углеводород за CxHy.
Сначала про массы углекислого газа и воды.
CxHy + (2x+y/2)O2 => xCO2 + (y/2)H2O
m CxHy = 8.6г,
M CxHy = (12x+y) г/моль =>
n CxHy = 8.6 / (12x+y) моль
Из уравнения n CO2 = x * n CxHy = 8.6x/(12x+y) моль, в то же время по условию
n CO2 = m CO2 / M CO2 = 26.4 г /44 г/моль = 0.6 моль
Для воды
n H2O = 4.3y/(12x+y) г/моль
n H2O = 12.6 г / 18 г/моль = 0.7 моль
Так что получилась система
8.6x = 7.2x + 0.6y
4.3y = 8.4x + 0.7y,
оба уравнения которой равносильны 7x = 3y. Так что одно из условий лишнее.
Плотность искомого углеводорода 3.84 г/л = m / V = (M*n) / (n*Vm) = M / Vm = (12x+y) г/моль / 22.4 л/моль
12x+y = 86
Вспоминая при 7x=3y, решаем <...> x=6, y=14
Так что это C6H14, алкан
С новым годом!
Не совсем понятно, к чему тут плотность - к воде, что ли? По-моему, дана плотность углеводорода.
Обозначим искомый углеводород за CxHy.
Сначала про массы углекислого газа и воды.
CxHy + (2x+y/2)O2 => xCO2 + (y/2)H2O
m CxHy = 8.6г,
M CxHy = (12x+y) г/моль =>
n CxHy = 8.6 / (12x+y) моль
Из уравнения n CO2 = x * n CxHy = 8.6x/(12x+y) моль, в то же время по условию
n CO2 = m CO2 / M CO2 = 26.4 г /44 г/моль = 0.6 моль
Для воды
n H2O = 4.3y/(12x+y) г/моль
n H2O = 12.6 г / 18 г/моль = 0.7 моль
Так что получилась система
8.6x = 7.2x + 0.6y
4.3y = 8.4x + 0.7y,
оба уравнения которой равносильны 7x = 3y. Так что одно из условий лишнее.
Плотность искомого углеводорода 3.84 г/л = m / V = (M*n) / (n*Vm) = M / Vm = (12x+y) г/моль / 22.4 л/моль
12x+y = 86
Вспоминая при 7x=3y, решаем <...> x=6, y=14
Так что это C6H14, алкан
С новым годом!
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