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Why is the mole fraction of solute in a 1 molal aqueous solution around 0.0177?

Answer and explanation

Correct answer: Because 1 kg water has about 55.5 mol water

A 1 molal aqueous solution contains 1 mol of solute in 1 kg of water. Using the molar mass of water, 18 g mol−1, the solvent contains 1000/18 ≈ 55.5 mol water. Therefore, total moles are 1 + 55.5 = 56.5 mol, and the solute mole fraction is x = 1/56.5 ≈ 0.0177. Hence option A is correct; the other statements confuse volume, mass, or concentration units.

Related tags

MolalityMole FractionAqueous SolutionMole ConceptMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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