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In two compounds, a fixed mass of 16 g of A combines with 27 g and 81 g of B, respectively. What is the simplest ratio of the masses of B?

Answer and explanation

Correct answer: 1:3

This item applies the law of multiple proportions. Because A has the same mass, 16 g, in both compounds, the required comparison is between the corresponding B masses only. In the stated order, that ratio is 27:81. The greatest common divisor is 27, so 27/27 : 81/27 = 1:3. Therefore, option D is correct. Option C is the correct unsimplified ratio, but the question asks for the simplest form. Option B incorrectly compares A's mass with B's mass. Option A gives the reverse order, 81:27, rather than 27:81. Thus the fixed mass of A establishes the comparison, while the final simplified ratio contains only the masses of B.

Related tags

ChemistryLaw Of Multiple ProportionsRatio SimplificationLaws Of Chemical CombinationClass 11 ChemistrySome Basic Concepts Of ChemistryClass 11 Mcq

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