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A solution has 40 percent solute by mass. The molar mass of solute is 80 and solvent is water. What is the approximate mole fraction of solute?

Answer and explanation

Correct answer: 0.130

Choose a convenient 100 g solution basis: it contains 40 g solute and 60 g water. Solute moles = 40/80 = 0.50 mol, while water moles = 60/18 ≈ 3.33 mol. Total moles are about 3.83 mol, so the solute mole fraction is 0.50/3.83 ≈ 0.130. Option B is correct; 0.400 is the mass fraction, not the mole fraction.

Related tags

Mass PercentMole FractionMolar MassSolution CompositionMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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