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In a pure compound, the mass ratio A:B is 2:9 and the total mass is 55 grams. What is the mass of B?

Answer and explanation

Correct answer: 45 grams

This problem uses the definite-proportions principle and the parts method. The ratio A:B = 2:9 has 2 + 9 = 11 total parts. The complete compound weighs 55 g, so the mass represented by one part is 55 ÷ 11 = 5 g. B corresponds to 9 parts; therefore its mass is 9 × 5 = 45 g. Thus option C is correct. Another check is to calculate the mass fraction of B: 9/11, and 55 × 9/11 also equals 45 g. Option A is only 2 parts and would correspond to A, not B. Option B is the mass of the whole compound, not one constituent, while option D is greater than the total mass and is physically impossible. The two constituent masses are 10 g and 45 g, whose sum is the stated 55 g.

Related tags

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

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