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In a pure compound, the mass ratio A:B is 3:4 and the total mass is 28 grams. What is the mass of A?

Answer and explanation

Correct answer: 12 grams

The governing concept is the fixed mass ratio in a pure compound. The ratio A:B = 3:4 contains 3 + 4 = 7 total parts. Since the complete compound has a mass of 28 g, one part weighs 28 ÷ 7 = 4 g. Substance A occupies three parts, so its mass is 3 × 4 = 12 g. Therefore option A is correct. Option B treats the two substances as equal or divides the total incorrectly, option C corresponds to four parts and is actually the mass of B, and option D does not follow the stated ratio. A useful check is that the two calculated masses are A = 12 g and B = 16 g; their sum is 28 g and their ratio is 12:16 = 3:4.

Related tags

Definite ProportionsMass RatioCompound CalculationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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