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A 3 molal glucose solution has density 1.15 g mL−1. What is its approximate molarity?

Answer and explanation

Correct answer: 2.24 mol L−1

Molality is moles of solute per kilogram of solvent, whereas molarity is moles per litre of solution. Take 1 kg water, so 3 mol glucose are present. Glucose mass = 3 × 180 = 540 g; solution mass = 1540 g. Its volume is 1540/1.15 = 1339 mL = 1.339 L. Therefore molarity = 3/1.339 ≈ 2.24 mol L−1, so option B is correct. Options A, C and D result from using an incorrect solution mass or volume.

Related tags

MolalityMolarityMole ConceptSolution ConcentrationMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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