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Консультация № 181255
12.12.2010, 22:13
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1
Здравствуйте, уважаемые эксперты! Прошу Вас ответить на следующий вопрос:
В баллоне при давлении 16•103 Па содержится газ при температуре 47 0С. Когда 1/3 массы газа была выпущена из баллона, температура снизилась на 20 0С. Как изменилось давление?
В баллоне при давлении 16•103 Па содержится газ при температуре 47 0С. Когда 1/3 массы газа была выпущена из баллона, температура снизилась на 20 0С. Как изменилось давление?
Обсуждение
13.12.2010, 06:05
общий
это ответ
Здравствуйте, Марина!
Запишем уравнение состояния до и после того, как часть газа была выпущена наружу:
P1*V=m1*R*T1/M
P2*V=m2*R*T2/M
Искомое давление будет равно:
P2=m2*R*T2/(M*V)
Из первого уравнения выразим:
R/(M*V)=P1/(m1*T1)
подставим во второе и получим:
P2=m2*T2*P1/(m1*T1)
с учетом того, что m2=m1 - m1/3=2/3*m1 получим:
P2=2/3*m1*T2*P1/(m1*T1)=2*T2*P1/(3*T1)
Вычислим искомую величину:
P2=2*16*103*300/(3*320)=104 (Па)
Будут вопросы обращайтесь в минифлрум.
Удачи
Запишем уравнение состояния до и после того, как часть газа была выпущена наружу:
P1*V=m1*R*T1/M
P2*V=m2*R*T2/M
Искомое давление будет равно:
P2=m2*R*T2/(M*V)
Из первого уравнения выразим:
R/(M*V)=P1/(m1*T1)
подставим во второе и получим:
P2=m2*T2*P1/(m1*T1)
с учетом того, что m2=m1 - m1/3=2/3*m1 получим:
P2=2/3*m1*T2*P1/(m1*T1)=2*T2*P1/(3*T1)
Вычислим искомую величину:
P2=2*16*103*300/(3*320)=104 (Па)
Будут вопросы обращайтесь в минифлрум.
Удачи
5
Спасибо!
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