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In a pure compound, the mass ratio A:B is 8:11 and the total mass is 76 grams. What is the mass of A?

Answer and explanation

Correct answer: 32 grams

The governing concept is the law of definite proportions: the elements in a pure compound occur in a constant mass ratio. For A:B = 8:11, the total number of parts is 8 + 11 = 19. The total mass of 19 parts is 76 g, so one part has a mass of 76 ÷ 19 = 4 g. A represents 8 parts, giving 8 × 4 = 32 g. Therefore option D is correct. Option A, 44 g, corresponds to B’s eleven parts; option B is the mass of the whole compound, not A alone. Option C does not satisfy the ratio. The check is straightforward: A = 32 g and B = 44 g total 76 g, and 32:44 simplifies by 4 to 8:11. Thus the result is consistent with both the stated total and the fixed composition.

Related tags

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

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