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Консультация № 178809
02.06.2010, 01:42
41.49 руб.
0
4
1
Здраствуйте!помогите пожалуйста!
ОбЪем кислорода массой 2кг увеличился в 5 раз .Один раз изотермическом процессе, другой раз в диабатическом процессе.Найти изменение энтропии в каждом из указанных процессов.с описанием пожалуйста!
Спасибо!
ОбЪем кислорода массой 2кг увеличился в 5 раз .Один раз изотермическом процессе, другой раз в диабатическом процессе.Найти изменение энтропии в каждом из указанных процессов.с описанием пожалуйста!
Спасибо!
Обсуждение
Неизвестный
02.06.2010, 03:13
общий
смирнов игорь:
Это задача из Чёртова, вот достаточно подробное (на мой взгляд) решение (не моё): http://s42.radikal.ru/i096/1006/2d/9236318c64db.gif
Это задача из Чёртова, вот достаточно подробное (на мой взгляд) решение (не моё): http://s42.radikal.ru/i096/1006/2d/9236318c64db.gif
02.06.2010, 04:32
общий
02.06.2010, 11:45
это ответ
Здравствуйте, смирнов игорь.
Как известно, изменение энтропии выражается общей формулой:
[$916$]S=S2-S1=AB[$8747$]dQ/T, где A и B - пределы интегрирования, соответствующие начальному и конечному состояниям системы. Так как процесс равновесный, то интегрирование проводится по любому пути.
Рассмотрим каждый из процессов в отдельности:
1) Изотермический процесс
Вынесем за знак интеграла постоянные величины и произведем интегрирование, тогда получим
[$916$]S=[$8747$]dQ/T=1/T*[$8747$]dQ (т.к. T=const)
При изотермическом процессе Q=A=m/M*R*T*ln(V2/V1)
И тогда окончательно получим выражение для изменения энтропии:
[$916$]S=m/M*R*ln(V2/V1)
Вычислим искомую величину:
[$916$]S=2/0,032*8,31*ln5=835.9 (Дж)
2) Адиабатный процесс
С учетом того, что при адиабатном процессе Q=0 имеем
[$916$]S=[$8747$]dQ/T=0
Как известно, изменение энтропии выражается общей формулой:
[$916$]S=S2-S1=AB[$8747$]dQ/T, где A и B - пределы интегрирования, соответствующие начальному и конечному состояниям системы. Так как процесс равновесный, то интегрирование проводится по любому пути.
Рассмотрим каждый из процессов в отдельности:
1) Изотермический процесс
Вынесем за знак интеграла постоянные величины и произведем интегрирование, тогда получим
[$916$]S=[$8747$]dQ/T=1/T*[$8747$]dQ (т.к. T=const)
При изотермическом процессе Q=A=m/M*R*T*ln(V2/V1)
И тогда окончательно получим выражение для изменения энтропии:
[$916$]S=m/M*R*ln(V2/V1)
Вычислим искомую величину:
[$916$]S=2/0,032*8,31*ln5=835.9 (Дж)
2) Адиабатный процесс
С учетом того, что при адиабатном процессе Q=0 имеем
[$916$]S=[$8747$]dQ/T=0
5
02.06.2010, 08:59
общий
vitalkise:
Пожалуйста, не путайтесь в записи формул (и не вводите в заблуждение других)
Энтропия считается по формуле dS=dQ/T
А dQ/dT - это теплоёмкость
Пожалуйста, не путайтесь в записи формул (и не вводите в заблуждение других)
Энтропия считается по формуле dS=dQ/T
А dQ/dT - это теплоёмкость
Решение остается тем же, только в записи убрать. Внесите корректировку пожалуйста. Заранее благодарен.
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