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Консультация № 109659
16.11.2007, 10:36
0.00 руб.
0
1
1
Будьте добры,помогите решить задачи. Заранее спасибо.
1)Определить среднюю квадратичную скорость <υкн> молекулы газа, заключённого в сосуд вместимостью V = 2 л под давлением P = 200 кПа, масса газа m = 0,3 г.
2) Определить молярную массу газа, если разность его удельных теплоёмкостей Cр – Сv = 2,08 кДж/ (кг. К.)
1)Определить среднюю квадратичную скорость <υкн> молекулы газа, заключённого в сосуд вместимостью V = 2 л под давлением P = 200 кПа, масса газа m = 0,3 г.
2) Определить молярную массу газа, если разность его удельных теплоёмкостей Cр – Сv = 2,08 кДж/ (кг. К.)
Обсуждение
Неизвестный
17.11.2007, 15:27
общий
это ответ
Здравствуйте, !
1. Запишем уравнение состояния идеального газа:
p=m0*n*U^2/3;
n=N/V - концентрация молекул газа
p=m0*N*U^2/(3*V);
m0*N=m – масса газа.
m0 - масса одной молекулы
N - их количество
p=m*U^2/(3*V);
U=sqrt(3*V*p/m);
2.
cp-cv=R/M;
Вывод формулы:
Q1=Q2-A; (газ при постоянном давлении еще выполняет работу)
cv*m*T=cp*m*T-m*R*T/M ;
cv=cp-R/M ;
cp-cv=R/M;
M=R/(cp-cv);
R=8.31 – универсальная газовая постоянная
1. Запишем уравнение состояния идеального газа:
p=m0*n*U^2/3;
n=N/V - концентрация молекул газа
p=m0*N*U^2/(3*V);
m0*N=m – масса газа.
m0 - масса одной молекулы
N - их количество
p=m*U^2/(3*V);
U=sqrt(3*V*p/m);
2.
cp-cv=R/M;
Вывод формулы:
Q1=Q2-A; (газ при постоянном давлении еще выполняет работу)
cv*m*T=cp*m*T-m*R*T/M ;
cv=cp-R/M ;
cp-cv=R/M;
M=R/(cp-cv);
R=8.31 – универсальная газовая постоянная
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