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Консультация № 108901
11.11.2007, 08:58
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Здравствуйте, уважаемые эксперты!
Вычислить удельные теплоемкости газа, зная, что его молярная масса М=4*10^3 кг/моль и отношение теплоемкостей Ср/Сv=1,67.
Вычислить удельные теплоемкости газа, зная, что его молярная масса М=4*10^3 кг/моль и отношение теплоемкостей Ср/Сv=1,67.
Обсуждение
Неизвестный
12.11.2007, 09:08
общий
это ответ
Здравствуйте, Z00z1e!
Вычислить удельные теплоемкости газа, зная, что его молярная масса М=4*10^3 кг/моль и отношение теплоемкостей Ср/Сv=1,67.
Cp = Cv + R - по свойству идеальных газов
Cp/Cv = (Cv + R)/Cv = 1 + R/Cv = 5/3
R/Cv = 2/3
Cv = (3/2)R - молярная теплоёмкость (газ одноатомный)
Cp = Cv + R = (5/2)R
cv = (3/2)R/mu - удельная теплоёмкость при постоянном объёме
cv = (5/2)R/mu - удельная теплоёмкость при постоянном давлении
mu - молярная масса. Что-то указанная Вами молярная масса слишком велика для газов.
Обычные значения порядка 2-100 грамм/моль.
Я так полагаю, что Ваш газ - гелий. Это подходит и из соображений величин Cv и Cp, и из факта, что его молярная масса 4*10^(-3) кг/моль.
Вычислить удельные теплоемкости газа, зная, что его молярная масса М=4*10^3 кг/моль и отношение теплоемкостей Ср/Сv=1,67.
Cp = Cv + R - по свойству идеальных газов
Cp/Cv = (Cv + R)/Cv = 1 + R/Cv = 5/3
R/Cv = 2/3
Cv = (3/2)R - молярная теплоёмкость (газ одноатомный)
Cp = Cv + R = (5/2)R
cv = (3/2)R/mu - удельная теплоёмкость при постоянном объёме
cv = (5/2)R/mu - удельная теплоёмкость при постоянном давлении
mu - молярная масса. Что-то указанная Вами молярная масса слишком велика для газов.
Обычные значения порядка 2-100 грамм/моль.
Я так полагаю, что Ваш газ - гелий. Это подходит и из соображений величин Cv и Cp, и из факта, что его молярная масса 4*10^(-3) кг/моль.
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