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A gaseous mixture contains H2 and O2 in the molar ratio 8:1. The ratio of H2:O2 by weight in this mixture would be

1. 4:1
2. 1:8
3. 8:1
4. 1:2

Correct answer: 4:1

Solution

The molar mass of H2 is 2 g/mol, and that of O2 is 32 g/mol. In an 8:1 molar ratio, the weight ratio is (8 × 2):(1 × 32) = 16:32 = 4:1.

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