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The mole fraction of solute in water is 0.1. What is the approximate molality of the solution?

Answer and explanation

Correct answer: 6.17 mol kg−1

Assume 1 mol of total solution. A solute mole fraction of 0.1 means 0.1 mol solute and 0.9 mol water. The water mass is 0.9 × 18 = 16.2 g = 0.0162 kg. Molality is moles of solute per kilogram of solvent: 0.1/0.0162 = 6.1728 mol kg−1, approximately 6.17 mol kg−1. Therefore B is correct. The denominator must be solvent mass, not total solution mass.

Related tags

SolutionsMole FractionMolalityMole ConceptMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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