Practice question
Question
What is the boiling point elevation of a solution containing 6 g of urea (molar mass = 60 g/mol) in 500 g of water? ( Kb = 0.52 K kg mol⁻¹ )
Explanation
Moles of urea = (6/60) = 0.1 mol . Molality = (0.1/0.5) = 0.2 mol/kg . Δ Tb = 0.52 × 0.2 = 0.104 K .