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In a pure compound, the mass ratio A:B is 4:7 and the total mass is 44 grams. What is the mass of A?

Answer and explanation

Correct answer: 16 grams

The governing idea is the fixed composition of a pure compound: its constituent masses remain in a definite ratio. The ratio A:B = 4:7 contains 4 + 7 = 11 total parts. Since these 11 parts together weigh 44 g, one part weighs 44 ÷ 11 = 4 g. Element A occupies 4 parts, so its mass is 4 × 4 = 16 g. Equivalently, the mass fraction of A is 4/11 and 44 × 4/11 = 16 g. Therefore option B is correct. Option A, 28 g, is the mass corresponding to seven parts and would represent B; option C incorrectly assigns the entire sample to A; option D does not follow from the given ratio. The calculation also confirms that A + B = 16 + 28 = 44 g.

Related tags

ChemistryLaws-Of-Chemical-CombinationMass-RatioClass-11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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