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Консультация № 188610
07.01.2016, 17:47
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Какое осмотическое давление имеет раствор 50 г мочевины (NH2)2CO в 4 л воды при 15оС и до какой температуры его надо нагреть, чтобы повысить осмотическое давление на 25 кПа?
Приложение:
Какое осмотическое давление имеет раствор 50 г мочевины (NH2)2CO в 4 л воды при 15оС и до какой температуры его надо нагреть, чтобы повысить осмотическое давление на 25 кПа?
Приложение:
Обсуждение
07.01.2016, 22:42
общий
это ответ
Здравствуйте, eskimovisage1488!
Поскольку мочевина не диссоциирует, изотонический коэффициент равен единице.
Концентрация вещества C=50г/(60г/моль[$183$]4л)=0,208 моль/л
осмотическое давление p=iCRT=1[$183$]0,208моль/л[$183$]8,314Дж/(моль[$183$]К)[$183$](15+273,15)К=499 кПа[$8776$]500 кПа
чтобы повысить его на [$916$]p=25 кПа, температуру нужно повысить на
[$916$]T=[$916$]p/(iCR)=14,4 K
то есть температура должна повысится до T+[$916$]T=29,4[$176$]C
Поскольку мочевина не диссоциирует, изотонический коэффициент равен единице.
Концентрация вещества C=50г/(60г/моль[$183$]4л)=0,208 моль/л
осмотическое давление p=iCRT=1[$183$]0,208моль/л[$183$]8,314Дж/(моль[$183$]К)[$183$](15+273,15)К=499 кПа[$8776$]500 кПа
чтобы повысить его на [$916$]p=25 кПа, температуру нужно повысить на
[$916$]T=[$916$]p/(iCR)=14,4 K
то есть температура должна повысится до T+[$916$]T=29,4[$176$]C
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