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In a compound, the mass ratio of two elements is 3:4. If the total mass is 21 grams, what is the mass of the second element?

Answer and explanation

Correct answer: 12 grams

The governing idea is the law of definite proportions expressed through a fixed mass ratio. The ratio 3:4 contains 3 + 4 = 7 equal parts. Since the total mass is 21 g, one part has a mass of 21 ÷ 7 = 3 g. The second element occupies four parts, so its mass is 4 × 3 = 12 g. Therefore, option B is correct. The first element would have 3 × 3 = 9 g, and 9 + 12 = 21 g, which checks the result. Option A is the mass of the first element, while 14 g and 16 g do not satisfy the stated 3:4 division of the total mass. The ratio must be applied to the total rather than treated as a direct gram value.

Related tags

ChemistryDefinite ProportionsMass RatioLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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