Вопрос школьника по предмету Химия
При полном окислении метанола массой 3,2 г образуется углекислый газ объемом (н. у):
а) 8,8 дм3; б) 4,4 дм3; в) 2,24 дм3; г) 4,48 дм3.
Ответ учителя по предмету Химия
Дано:
m(CH₃OH)=3.2 грамм
Найти:
V(CO₂) — ?
Решение:
2CH₃OH+3O₂=2CO₂+4H₂O
1)n(CH₃OH)=3.2 грамм/32 грамм/моль=0.1 моль
n(CH₃OH)=n(CO₂)=0.1 моль
2)V(CO₂)=0.1 моль*22.4 л/моль=2.24 литра=2.24 дм³
Ответ: в)2.24 дм³
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