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In a pure compound, the mass ratio A:B is 6:5 and the total mass is 66 grams. What is the mass of B?

Answer and explanation

Correct answer: 30 grams

The question is based on the law of definite proportions, expressed here through a simple mass-ratio calculation. The ratio A:B = 6:5 contains 6 + 5 = 11 parts altogether. Since the complete compound has a mass of 66 g, one ratio part equals 66 ÷ 11 = 6 g. B represents 5 parts, so its mass is 5 × 6 = 30 g. Thus option A is correct. Option B, 36 g, corresponds to A’s six parts; option C is the mass of the whole sample, not B alone; and option D does not result from the ratio. A useful check is that A has mass 36 g and B has mass 30 g, giving a total of 66 g. Their ratio is 36:30, which reduces by 6 to 6:5, exactly as required.

Related tags

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

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