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In a binary solution, the mole fraction of solvent is 0.75 and moles of solute are 3. How many moles of solvent are present?

Answer and explanation

Correct answer: 9 mol

Let y represent the moles of solvent. Because the solution is binary, its only components are solvent and solute, so the total moles are y + 3. The solvent mole fraction is therefore y/(y + 3). Set this equal to the given value: y/(y + 3) = 0.75. Solving gives y = 0.75y + 2.25, so 0.25y = 2.25 and y = 9 mol. Hence option A is correct. Verification gives 9/(9 + 3) = 9/12 = 0.75. The binary condition matters because no third component is added to the denominator. The other choices produce different solvent fractions and therefore cannot satisfy the stated information.

Related tags

Binary SolutionMole FractionConcentration MetricsSolutionsMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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