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Консультация № 191538
25.10.2017, 16:27
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
В баллоне находится смесь гелия и азота. Молярная масса смеси 12 г/моль. Найдите отношение концентрации гелия к концентрации молекул азота.
В баллоне находится смесь гелия и азота. Молярная масса смеси 12 г/моль. Найдите отношение концентрации гелия к концентрации молекул азота.
Обсуждение
30.10.2017, 15:38
общий
это ответ
Здравствуйте, danil_matveev1!
Молярные массы гелия и азота соответственно равны
и 
г/моль. Обозначим через 
и 
соответственно концентрации (массовые доли) гелия и азота в смеси.
Для решения задачи составим систему уравнений
Уравнение
выражает тот факт, что молярная масса смеси равна 
г/моль, а уравнение 
- тот факт, что концентрации гелия и азота в смеси в сумме дают единицу (сумма их процентных концентраций равна 
). Решая эту систему уравнений, получим
Молярные массы гелия и азота соответственно равны
и г/моль. Обозначим через и соответственно концентрации (массовые доли) гелия и азота в смеси.Для решения задачи составим систему уравнений
Уравнение
выражает тот факт, что молярная масса смеси равна г/моль, а уравнение - тот факт, что концентрации гелия и азота в смеси в сумме дают единицу (сумма их процентных концентраций равна ). Решая эту систему уравнений, получим
Об авторе:
Facta loquuntur.
Facta loquuntur.
и 
г/моль соответственно.
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