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If the mass ratio of hydrogen to oxygen in water is 1:8, how much oxygen is needed for 3 grams of hydrogen?

Answer and explanation

Correct answer: 24 grams

The governing concept is the law of definite proportions: in pure water, hydrogen and oxygen always combine in a fixed mass ratio of 1:8. The question gives 3 g of hydrogen, which is three times the 1-part hydrogen amount. The oxygen required must therefore also be scaled by three: 8 × 3 = 24 g. Hence option C is correct. Option A would be correct only for 1 g of hydrogen, option B does not preserve the given ratio, and option D has no basis in the 1:8 relationship. The calculation can also be written as H:O = 1:8, so 3:O = 1:8; cross-multiplication gives O = 3 × 8 = 24 g. The resulting total water mass would be 27 g.

Related tags

Definite ProportionsMass RatioWater CompositionLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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