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A solution has molality 2. If the mass of solvent is 250 g what are the moles of solute?

Answer and explanation

Correct answer: 0.50 mol

Molality is defined as moles of solute per kilogram of solvent, not per kilogram of solution. Convert the solvent mass: 250 g = 0.250 kg. Using moles of solute = molality × mass of solvent in kg gives n = 2 mol kg⁻¹ × 0.250 kg = 0.50 mol. Therefore option B is correct; using 250 directly would ignore the required kilogram conversion.

Related tags

MolalityMoles CalculationUnit ConversionMole ConceptMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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