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Question
If 10 volumes of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour would be produced?
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Solution
Reaction of dihydrogen with dioxygen can be written as:
\[\ce{2H_{2(g)} + O_{2(g)} → 2H2O_{(g)}}\]
Now, two volumes of dihydrogen react with one volume of dioxygen to produce two volumes of water vapour.
Hence, ten volumes of dihydrogen will react with five volumes of dioxygen to produce ten volumes of water vapour.
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