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In a pure compound the mass ratio A:B is 6:11 and total mass is 68 grams. What is the mass of B?

Answer and explanation

Correct answer: 44 grams

The governing concept is the law of definite proportions: the elements of a pure compound are present in a fixed ratio by mass. Here the ratio A:B is 6:11, so the compound contains 6 + 11 = 17 ratio parts. The mass of one part is 68 g ÷ 17 = 4 g. Since B accounts for 11 parts, its mass is 11 × 4 = 44 g. Therefore, option A is correct. Option B corresponds to A because 6 × 4 = 24 g. Option C is the complete compound mass, not B alone, and option D is inconsistent with the ratio. The check 24 g + 44 g = 68 g confirms the result.

Related tags

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

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