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In a pure compound the mass ratio A:B is 7:3 and total mass is 50 grams. What is the mass of B?

Answer and explanation

Correct answer: 15 grams

This problem uses the law of definite proportions, according to which a pure compound has a constant composition by mass. The stated ratio A:B = 7:3 contains 7 + 3 = 10 equal ratio parts. The total mass is 50 g, so each part represents 50 ÷ 10 = 5 g. B occupies 3 parts; therefore, its mass is 3 × 5 = 15 g. Option D is correct. Option A is the mass of A because 7 × 5 = 35 g. Option B is the total mass and cannot be the mass of only B, while option C does not result from the given ratio. Adding 35 g and 15 g gives the stated total of 50 g.

Related tags

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

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