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In a pure compound A and B are in the ratio 6:11. If A is 18 grams, how much is B?

Answer and explanation

Correct answer: 33 grams

The fixed ratio A:B = 6:11 means that the masses must be multiplied by the same factor. Since A changes from 6 parts to 18 grams, the scale factor is 18 ÷ 6 = 3. Therefore, B has a mass of 11 × 3 = 33 grams, so option B is correct. The answer is not 22 grams, which would correspond to multiplying 11 by 2; 36 grams incorrectly doubles the given mass of A; and 44 grams would multiply 11 by 4. The governing concept is the law of definite proportions: a pure compound always contains its elements in a fixed mass ratio.

Related tags

Law Of Definite ProportionsChemical RatioMass RatioCompoundLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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