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In a pure compound, the mass ratio A:B is 9:5 and the total mass is 70 grams. What is the mass of B?

Answer and explanation

Correct answer: 25 grams

The question uses the fixed-composition principle for a pure compound. The ratio A:B = 9:5 contains 9 + 5 = 14 total parts. Since the total mass is 70 g, the mass of one part is 70 ÷ 14 = 5 g. B corresponds to 5 parts, so its mass is 5 × 5 = 25 g. Thus option A is correct. Option B, 45 g, belongs to A because A has nine parts. Option C is the total mass of the entire compound, not the mass of B alone. Option D is not produced by the given ratio. A consistency check gives A = 45 g and B = 25 g; their sum is 70 g, and their ratio 45:25 simplifies by 5 to 9:5. Therefore the selected answer satisfies the governing law and the numerical data.

Related tags

ChemistryLaws-Of-Chemical-CombinationMass-RatioClass-11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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