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The proportion of oxygen to hydrogen by mass in the water is 8 : 1
18 g of water contains 16 g of O.
Therefore,
2.16 g of water will contain = (2.16 × 16) / 18 = 1.92 g of O
Mass of H = mass of water – mass of O
Mass of H = 2.16 – 1.92
Mass of H = 0.24 g
Proportion = oxygen / hydrogen
Proportion = 1.92 / 0.24
Proportion = 8 : 1
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