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A solution has mole fraction of solute 0.2 and the solvent is water. What is the approximate molality of the solution?

Answer and explanation

Correct answer: 13.9 mol kg−1

For a binary solution, take 1 mol of total solution. The solute amount is 0.2 mol and water is 0.8 mol. The solvent mass is 0.8 × 18 = 14.4 g = 0.0144 kg. Molality equals moles of solute divided by kilograms of solvent, so m = 0.2/0.0144 = 13.89 mol kg−1, approximately 13.9 mol kg−1. Hence B is correct; using total solution mass or 1 kg water without conversion produces the distractors.

Related tags

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

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