Practice question

Given: Calculate the boiling point elevation of a solution containing 9 g of urea ( NH₂CONH₂ ) in 200 g of water. ( K_b = 0.52 K kg/mol, Molar mass of urea = 60 g/mol ) Formula: Moles of urea = 9/60 = 0.15 mol. Substitution & Calculation: Molality = 0.15/0.2 = 0.75 mol/kg . Δ T_b = 0.52 × 0.75 = 0.39 K . Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.