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Консультация № 191521
23.10.2017, 19:34
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Во сколько раз коэффициент диффузии молекул водорода больше коэффициента диффузии молекул азота? Температура и давление газов одинаковые.
Во сколько раз коэффициент диффузии молекул водорода больше коэффициента диффузии молекул азота? Температура и давление газов одинаковые.
Обсуждение
29.10.2017, 18:09
общий
это ответ
Здравствуйте, tata15291!
Коэффициент диффузии определяется формулой
где
- средняя скорость теплового движения молекул с молярной массой M при температуре T,
- средняя длина пробега молекул с эффективным диаметром d при температуре T и давлении P. С учётом этого формула примет вид
откуда видно, что при постоянных температуре и давлении коэффициент диффузии обратно пропорционален квадрату диаметра молекул и корню квадратному из их молярной массы.
В данном случае для водорода (H[sub]2[/sub]) M = 2 г/моль и d = 0.23 нм, а для азота (N[sub]2[/sub]) M = 14 г/моль и d = 0.31 нм, поэтому отношение коэффициентов диффузии будет равно
Коэффициент диффузии определяется формулой
где
- средняя скорость теплового движения молекул с молярной массой M при температуре T,
- средняя длина пробега молекул с эффективным диаметром d при температуре T и давлении P. С учётом этого формула примет вид
откуда видно, что при постоянных температуре и давлении коэффициент диффузии обратно пропорционален квадрату диаметра молекул и корню квадратному из их молярной массы.
В данном случае для водорода (H[sub]2[/sub]) M = 2 г/моль и d = 0.23 нм, а для азота (N[sub]2[/sub]) M = 14 г/моль и d = 0.31 нм, поэтому отношение коэффициентов диффузии будет равно
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