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Консультация № 194578
03.02.2019, 17:22
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1
Здравствуйте! Прошу помощи в следующем вопросе:
6. Некоторая масса азота при давлении 100 кПа имела объём 5 л, а при давлении 300 к Па – объём 2 л. Переход от первого состояния ко второму был сделан в два этапа: сначала по изохоре, а затем по изобаре. Определить изменение внутренней энергии, количество теплоты и произведённую работу. Сделать рисунок.
Рисунок желательно.
6. Некоторая масса азота при давлении 100 кПа имела объём 5 л, а при давлении 300 к Па – объём 2 л. Переход от первого состояния ко второму был сделан в два этапа: сначала по изохоре, а затем по изобаре. Определить изменение внутренней энергии, количество теплоты и произведённую работу. Сделать рисунок.
Рисунок желательно.
Обсуждение
08.02.2019, 02:25
общий
это ответ
Здравствуйте, dar777!
Для первого состояния имеем P[sub]1[/sub] = 100000 Па, V[sub]1[/sub] = 0.005 м[sup]3[/sup], а для второго - P[sub]2[/sub] = 300000 Па, V[sub]2[/sub] = 0.002 м[sup]3[/sup]. Работа, совершённая газом при изменении объёма на величину [$916$]V и давлении P равна
В данном случае при изохорном процессе V = const, то есть [$916$]V = 0 и A = 0, а при изобарном процессе
Дж
(знак "-" означает что работа была совершена внешними силами).
Внутренняя энергия двухатомного газа (например, азота) с температурой T и массой m равна
где M - молярная масса, R - универсальная газовая постоянная. С другой стороны, в соответствии с уравнением Менделеева-Клайперона
откуда
и изменение внутренней энергии равно
Дж.
По первому закону термодинамики количество теплоты равно
Дж
(знак "-" означает что газ теряет теплоту).
Для первого состояния имеем P[sub]1[/sub] = 100000 Па, V[sub]1[/sub] = 0.005 м[sup]3[/sup], а для второго - P[sub]2[/sub] = 300000 Па, V[sub]2[/sub] = 0.002 м[sup]3[/sup]. Работа, совершённая газом при изменении объёма на величину [$916$]V и давлении P равна
В данном случае при изохорном процессе V = const, то есть [$916$]V = 0 и A = 0, а при изобарном процессе
Дж(знак "-" означает что работа была совершена внешними силами).
Внутренняя энергия двухатомного газа (например, азота) с температурой T и массой m равна
где M - молярная масса, R - универсальная газовая постоянная. С другой стороны, в соответствии с уравнением Менделеева-Клайперона
откуда
и изменение внутренней энергии равно
Дж.По первому закону термодинамики количество теплоты равно
Дж(знак "-" означает что газ теряет теплоту).
5
Это самый лучший ответ!
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