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Задать вопрос экспертам

Консультация № 194741

20.02.2019, 13:51

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20.02.2019, 23:53

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Образование

Здравствуйте! У меня возникли сложности с таким вопросом:

Решить задачу.

При сжигании смеси паров метаналя и этаналя массой 26,6 г образовался оксид углерода (IV) объёмом 24,64 л (н. у.).
Определите химическое количество метаналя в смеси.

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Обсуждение

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Roman Chaplinsky / Химик CH

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156417
2175

21.02.2019, 00:11

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это ответ

Здравствуйте, svrvsvrv!
количество углекислого газа
n(CO₂)=24,64л/22,4л/моль=1,1 моль=n(CH₂O)+2n(CH₃CHO)
масса альдегидов
m=n(CH₂O)[$183$]30г/моль+(CH₃CHO)[$183$]44г/моль=26,6 г
выражаем количество этаналя из первого выражения
n(CH₃CHO)=(1,1моль-n(CH₂O))/2
и подставляем во второе
30n(CH₂O)+44(1,1-n(CH₂O))/2=26,6
30n(CH₂O)+24,2-22n(CH₂O))=26,6
8n(CH₂O)=2,4
n(CH₂O)=0,3 моль

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