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A solution contains 500 g water and 34.2 g sucrose. What is the approximate mole fraction of sucrose?

Answer and explanation

Correct answer: 0.0036

Mole fraction requires moles of each component, not their masses directly. Sucrose moles = 34.2/342 = 0.100 mol. Water moles = 500/18 ≈ 27.78 mol. Total moles = 27.78 + 0.100 = 27.88 mol. Thus sucrose mole fraction = 0.100/27.88 ≈ 0.0036, so option A is correct. Using the mass ratio or forgetting water in the denominator would give the larger distractor values.

Related tags

SucroseMole FractionMolar MassAqueous SolutionMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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