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In a pure compound, the mass ratio A:B is 10:3 and the total mass is 52 grams. What is the mass of A?

Answer and explanation

Correct answer: 40 grams

This problem uses the fixed-composition principle for a pure compound. The mass ratio A:B = 10:3 contains 10 + 3 = 13 total parts. The complete sample has a mass of 52 g, so the mass represented by one ratio part is 52 ÷ 13 = 4 g. Constituent A occupies 10 parts; therefore, its mass is 10 × 4 = 40 g. Hence option C is correct. Option A corresponds to 3 parts, which would represent B, while option B assigns the entire sample to A and ignores B. Option D is greater than the total mass and is physically impossible. The calculation demonstrates how a stated composition can be converted directly into the mass of one constituent without needing any additional chemical data.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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