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Консультация № 176171
20.01.2010, 23:16
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Здравствуйте,уважаемые эксперты!
Помогите,пожалуйста, решить задачу:
Жесткий баллон заполнен идеальным газом. За время хранения давление газа упало на 20%. Как и на сколько процентов изменилась внутрення энергия газа?
СПАСИБО!
Помогите,пожалуйста, решить задачу:
Жесткий баллон заполнен идеальным газом. За время хранения давление газа упало на 20%. Как и на сколько процентов изменилась внутрення энергия газа?
СПАСИБО!
Обсуждение
21.01.2010, 09:32
общий
это ответ
Здравствуйте, Миронычев Виталий.
Внутренняя энергия идеального газа по определению
U=(i/2)v*R*T (1),
где i - число степеней свободы молекул, v (ню) - количество вещества, R = 8,31 Дж/моль*К - универсальная газовая постоянная, Т - температура (абсолютная).
Давление газа
р=nkT (2)
- может понизится за счет уменьшения температуры (Т), или концентрации молекул (n) вследствие стравливания (тогда пропорционально уменьшится и количество вещества v), или за счет и того, и другого.
В любом случае, согласно формуле (1), внутренняя энергия понизится также на те же 20%.
Удачи
Внутренняя энергия идеального газа по определению
U=(i/2)v*R*T (1),
где i - число степеней свободы молекул, v (ню) - количество вещества, R = 8,31 Дж/моль*К - универсальная газовая постоянная, Т - температура (абсолютная).
Давление газа
р=nkT (2)
- может понизится за счет уменьшения температуры (Т), или концентрации молекул (n) вследствие стравливания (тогда пропорционально уменьшится и количество вещества v), или за счет и того, и другого.
В любом случае, согласно формуле (1), внутренняя энергия понизится также на те же 20%.
Удачи
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
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