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In a pure compound the mass ratio A:B is 3:8 and total mass is 55 grams. What is the mass of B?

Answer and explanation

Correct answer: 40 grams

This question is governed by the law of definite proportions, which requires the masses of elements in a pure compound to remain in a fixed ratio. The ratio A:B = 3:8 has 3 + 8 = 11 total parts. Because the total compound mass is 55 g, one part weighs 55 ÷ 11 = 5 g. B occupies 8 parts, so its mass is 8 × 5 = 40 g. Thus, option D is correct. Option A gives the mass of A, since 3 × 5 = 15 g. Option B gives the entire compound mass, and option C does not satisfy the stated ratio. The check is 15 g + 40 g = 55 g and 15:40 simplifies to 3:8.

Related tags

ChemistryLaws-Of-Chemical-CombinationDefinite-ProportionsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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