Practice question

Given: Calculate the boiling point elevation of a solution containing 6 g of urea ( NH₂CONH₂ ) in 100 g of water. ( K_b = 0.52 K kg/mol, Molar mass of urea = 60 g/mol ) These values define the system as per NCERT data. Formula: Moles of urea = 6/60 = 0.1 mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Molality = 0.1/0.1 = 1 mol/kg . Δ T_b = 0.52 × 1 = 0.52 K . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.