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Консультация № 174725
01.12.2009, 00:31
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Уважаемые эксперты,требуется ваша помощь!
1) Газ при температуре Т=309 К и давлении р=0,7 МПа имеет плотность 12 кг/м3. Определить относительную молекулярную массу газа.
2) Определить удельную теплоемкость сv смеси газов, содержащей V1=5 л водорода и V2=3 л гелия. Газы находятся при одинаковых условиях.
3) Азот нагревается при постоянном давлении, причем ему было сообщено количество теплоты Q=21 кДж. Определить работу А, которую совершил при этом газ, и изменение его внутренней энергии дельта U.
Заранее спасибо!
1) Газ при температуре Т=309 К и давлении р=0,7 МПа имеет плотность 12 кг/м3. Определить относительную молекулярную массу газа.
2) Определить удельную теплоемкость сv смеси газов, содержащей V1=5 л водорода и V2=3 л гелия. Газы находятся при одинаковых условиях.
3) Азот нагревается при постоянном давлении, причем ему было сообщено количество теплоты Q=21 кДж. Определить работу А, которую совершил при этом газ, и изменение его внутренней энергии дельта U.
Заранее спасибо!
Обсуждение
03.12.2009, 00:31
общий
это ответ
Здравствуйте, Горбунов Кирилл Дмитриевич.
По первой задаче
Дано:
Т=309 К
р=0,7*106 Па
[$961$]=12 кг/м3
Найти: Mr
Решение:
Из уравнения Клапейрона pV=(m/M)RT и формулы плотности [$961$]=m/Vвыразим молярную массу М
M=[$961$]RT/p = 0.044 кг/моль
Относительная молекулярная масса
Mr=M/(10-3 кг/моль) = 44 - это значение соответствует углекислому газу
Удачи
По первой задаче
Дано:
Т=309 К
р=0,7*106 Па
[$961$]=12 кг/м3
Найти: Mr
Решение:
Из уравнения Клапейрона pV=(m/M)RT и формулы плотности [$961$]=m/Vвыразим молярную массу М
M=[$961$]RT/p = 0.044 кг/моль
Относительная молекулярная масса
Mr=M/(10-3 кг/моль) = 44 - это значение соответствует углекислому газу
Удачи
Об авторе:
С уважением
shvetski
С уважением
shvetski
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