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10 g solute is dissolved in 190 g water. If molar mass of solute is 50 what is the molality?

Answer and explanation

Correct answer: 1.05 mol kg−1

Molality is defined as moles of solute per kilogram of solvent, not per kilogram of the entire solution. Moles of solute = 10 g ÷ 50 g mol−1 = 0.20 mol. The water mass is 190 g = 0.190 kg. Thus, molality = 0.20 ÷ 0.190 = 1.0526, approximately 1.05 mol kg−1. Therefore option B is correct; using 10 g or 200 g as the solvent mass would produce distractor values.

Related tags

MolalityMoles Of SoluteSolvent MassConcentrationMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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