Practice question
Question
What is the freezing point depression of a solution containing 8 g of urea (molar mass = 60 g/mol) in 200 g of water? ( Kf = 1.86 K kg mol⁻¹ )
Explanation
Moles of urea = (8/60) ≈ 0.1333 mol . Molality = (0.1333/0.2) ≈ 0.6665 mol/kg . Δ Tf = 1.86 × 0.6665 ≈ 1.24 K .
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