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Консультация № 191168
18.06.2017, 20:43
0.00 руб.
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1
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:1. Некоторый газ массой 2 кг находится при температуре 300 К под давлением 0,5 МПа. В результате изотермического сжатия давление увеличилось в три раза. Работа, затраченная на сжатие,А=-1,37 кДж . Определить:
1) какой это газ;
2) первоначальную плотность газа.
1) какой это газ;
2) первоначальную плотность газа.
Обсуждение
24.06.2017, 03:44
общий
это ответ
Здравствуйте, asdf1234!
кг - масса газа,
К - температура газа,
Па - начальное давление газа,
- конечное давление газа,
Дж - работа, затраченная на сжатие газа,
Дж/(моль*К) - универсальная газовая постоянная,
- молярная масса газа,
- начальный объём газа,
- начальная плотность газа.
При изотермическом процессе сжатие газа осуществляется за счёт действия внешних сил. Работа
совершаемая газом при этом, отрицательна. Она численно равна площади фигуры под соответствующим участком графика процесса на диаграмме 
При изотермическом процессе работа
газа может быть найдена по формуле
откуда получаем
(кг/моль), что не соответствует никакому газу. Я предполагаю, что в условии задачи есть ошибка. Например, если 
Дж, то 
кг/моль, что соответствует гелию (см. здесь).
Из уравнения Клапейрона - Менделеева
получим
и если Дж, то
(кг/м3) - начальная плотность газа.
Разберитесь с условием задачи, обратившись к преподавателю.
кг - масса газа, К - температура газа, Па - начальное давление газа, - конечное давление газа, Дж - работа, затраченная на сжатие газа, Дж/(моль*К) - универсальная газовая постоянная, - молярная масса газа, - начальный объём газа, - начальная плотность газа.При изотермическом процессе сжатие газа осуществляется за счёт действия внешних сил. Работа
совершаемая газом при этом, отрицательна. Она численно равна площади фигуры под соответствующим участком графика процесса на диаграмме При изотермическом процессе работа
газа может быть найдена по формулеоткуда получаем
(кг/моль), Дж, то кг/моль, что соответствует гелию (см. здесь).Из уравнения Клапейрона - Менделеева
получим
и если
Дж, то (кг/м3) - начальная плотность газа.Разберитесь с условием задачи, обратившись к преподавателю.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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