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In a pure compound the mass ratio A:B is 5:7 and total mass is 48 grams. What is the mass of B?

Answer and explanation

Correct answer: 28 grams

The relevant concept is the law of definite proportions: a pure compound always contains its elements in a fixed mass ratio. Here A:B = 5:7, so the total number of ratio parts is 5 + 7 = 12. The mass represented by one part is 48 g ÷ 12 = 4 g. Element B occupies 7 parts, so its mass is 7 × 4 g = 28 g. Therefore, option B is correct. Option A corresponds to the mass of A, option C incorrectly assigns the entire compound mass to B, and option D does not follow the stated ratio. The two masses also check: A = 20 g and B = 28 g, giving 48 g in total and a ratio of 5:7.

Related tags

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

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