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In a pure compound the mass ratio A:B is 9:11 and total mass is 60 grams. What is the mass of B?

Answer and explanation

Correct answer: 33 grams

The governing principle is the law of definite proportions, stating that a pure compound has a constant mass composition. The ratio A:B is 9:11, so the total number of equal ratio parts is 9 + 11 = 20. The mass per part is 60 g ÷ 20 = 3 g. Since B represents 11 parts, its mass is 11 × 3 = 33 g. Therefore, option A is correct. Option B corresponds to A because 9 × 3 = 27 g. Option C is the total mass of the compound, not the mass of B, and option D does not agree with the given ratio. The values 27 g and 33 g add to 60 g and have the required ratio 9:11.

Related tags

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

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