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In a pure compound, the mass ratio A:B is 7:6 and the total mass is 65 grams. What is the mass of B?

Answer and explanation

Correct answer: 30 grams

This is an application of definite proportions using ratio parts. The mass ratio A:B = 7:6 has 7 + 6 = 13 total parts. The total mass is 65 g, therefore each part represents 65 ÷ 13 = 5 g. B occupies 6 parts, so its mass is 6 × 5 = 30 g. Hence option C is correct. Option A, 35 g, is the mass of A because A has seven parts. Option B gives the mass of the complete compound and cannot be the mass of only B. Option D is not obtained from the given ratio and would also make the corresponding value of A inconsistent with the total. Checking the result, A = 35 g and B = 30 g add to 65 g, while 35:30 reduces by 5 to 7:6, confirming the answer.

Related tags

ChemistryLaws-Of-Chemical-CombinationMass-RatioClass-11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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