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In two compounds, a fixed mass of 25 g of A combines with 30 g and 45 g of B, respectively. What is the simplest ratio of the masses of B?

Answer and explanation

Correct answer: 2:3

This problem uses the law of multiple proportions: when the mass of one element is fixed, the different masses of the other element are compared in a simple whole-number ratio. A is fixed at 25 g, so only the B masses, 30 g and 45 g, should be compared. Their ratio is 30:45. The greatest common divisor is 15, and division by 15 gives 30/15 : 45/15 = 2:3. Therefore, option B is correct. Option D is the unsimplified ratio. Option C incorrectly compares the fixed mass of A with one B mass. Option A reverses the required first-to-second order and gives 3:2 instead of 2:3.

Related tags

ChemistryLaw Of Multiple ProportionsSimple Whole-Number RatioLaws Of Chemical CombinationClass 11 ChemistrySome Basic Concepts Of ChemistryClass 11 Mcq

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