Practice question
Question
What is the molality of a solution prepared by dissolving 15 g of urea (molar mass = 60 g/mol) in 250 g of water?
Explanation
Moles of urea = (15/60) = 0.25 mol . Mass of solvent = 250 g = 0.25 kg. Molality = (0.25/0.25) = 1 mol/kg .
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