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If 16 g of O2 diffuses through a very narrow orifice in a certain time, what mass of H2 (in grams) would diffuse under identical conditions in the same time?

1. 2
2. 4
3. 8
4. 16

Correct answer: 4

Solution

By Graham's law, equal volumes (or masses adjusted for molar mass) of H2 diffuse 4 times faster than O2. The moles of O2 that diffuse = 16/32 = 0.5 mol. Moles of H2 in same time = 4 * 0.5 = 2 mol. Mass of H2 = 2 * 2 = 4 g.

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