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In a solution the mole fraction of solute is 0.25. If molar mass of solute is 60 and solvent is water what is the approximate mass percent of solute?

Answer and explanation

Correct answer: 52.6 percent

Mole fraction is based on the ratio of solute moles to total moles. Assume 1 mol total solution: solute = 0.25 mol and water = 0.75 mol. Solute mass = 0.25 × 60 = 15 g; water mass = 0.75 × 18 = 13.5 g. Total mass = 28.5 g. Therefore mass percent = (15/28.5) × 100 ≈ 52.6%, so option C is correct. Treating mole fraction as mass fraction would incorrectly suggest 25%.

Related tags

Mole FractionMass PercentMolar MassWater SolutionMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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