Рассчитайте объём кислорода,полученного из 200л воздуха,если известно, что объёмная доля кислорода в воздухе составляет 21%
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1
07.06.2019 00:10
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1
v(O₂)=21%
Найти: V(O₂)
Решение:
Составим пропорцию:200 л
100%х л 21%
х=200*21/100=42 л.
ответ: V(O₂)=42 л.