Practice question

Given: A solution contains 10 g of urea ( NH₂CONH₂ ) in 190 g of water. What is the molality of the solution? (Molar mass: NH₂CONH₂ = 60 g/mol ) These values define the system as per NCERT data. Formula: Moles of urea = 10/60 = 0.1667 mol. This is standard NCERT relation. Substitution & Calculation: Mass of solvent in kg = 190/1000 = 0.19 kg . Molality = 0.1667/0.19 = 0.877 mol/kg . Result: The computed value matches expected outcome and confirms correct choice as per NCERT.