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In a compound 3 grams A combines with 2 grams B. If B is 8 grams how much A is needed?

Answer and explanation

Correct answer: 12 grams

The direct answer is 12 grams, so option C is correct. The compound always combines its elements in a fixed mass ratio. Here, 3 grams of A combine with 2 grams of B. The new amount of B is 8 grams. First compare B: 8 ÷ 2 = 4, so the amount of B has become four times larger. The amount of A must also become four times larger to keep the same compound ratio. Therefore, A = 3 × 4 = 12 grams. Option A, 6 grams, is wrong because it is only twice 3 grams, while B has become four times 2 grams. Option B, 10 grams, does not follow the fixed ratio. Option C, 12 grams, correctly preserves the ratio 3:2, because 12:8 simplifies to 3:2. Option D, 16 grams, is too large and would give a different ratio. The important idea is the law of definite proportions: a pure compound has its elements in a fixed mass ratio. A useful exam cue is to find the multiplier of the known mass first, then multiply the other mass by the same number.

Related tags

Chemistry Laws Chemical CombinationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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