The chemical formula of water (H2O) shows that hydrogen and oxygen combine in a fixed mass ratio of:

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• A 1:8
• B 8:1
• C 1:2
• D 2:1

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Answer: A. 1:8

Mass of hydrogen in H2O = 2 × 1 u = 2 u and mass of oxygen = 16 u. The ratio 2 : 16 simplifies to 1 : 8.

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