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In a pure compound the mass ratio A:B is 3:4 and total mass is 35 grams. What is the mass of B?

Answer and explanation

Correct answer: 20 grams

The mass ratio A:B is 3:4, so the total number of parts is 3 + 4 = 7. Each part has mass 35 ÷ 7 = 5 g. Since B has 4 parts, its mass is 4 × 5 = 20 g. The value 15 g is the mass of A, not B. Exam tip: first add the ratio parts, then divide the total mass by their sum.

Related tags

ChemistryLaws Of Chemical CombinationMass RatioPure CompoundClass 11Stoichiometry BasicsSome Basic Concepts Of ChemistryClass 11 Mcq

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