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A mixture of gases contains H2 and O2 gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?

1. 4:1
2. 16:1
3. 2:1
4. 1:4

Correct answer: 16:1

Solution

The molar mass of H2 is 2 g/mol, and that of O2 is 32 g/mol. For a 1:4 weight ratio, 1 g of H2 corresponds to 0.5 moles, and 4 g of O2 corresponds to 0.125 moles. Thus, the molar ratio is 0.5:0.125 = 4:1.

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