Concentration units, Raoult's law, colligative properties, abnormal molar mass, van't Hoff factor.
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Q1 · Solutions (Class 12) · EASY
A solution is prepared by dissolving 6 g of urea (molar mass = 60 g/mol) in 180 g of water. What is the molality of the solution?
Q2 · Solutions (Class 12) · MEDIUM
The vapour pressure of pure water at 298 K is 23.8 mm Hg. What will be the vapour pressure of a solution containing 5% by mass of a non-volatile solute of molar mass 60 g/mol? (Molar mass of water = 18 g/mol)
Q3 · Solutions (Class 12) · HARD
A 0.1 molal aqueous solution of a weak acid HX is 20% ionised. The freezing point depression of this solution is (K_f for water = 1.86 K kg/mol):
Q4 · Solutions (Class 12) · MEDIUM
A solution containing 3.42 g of a non-volatile solute in 250 g of water has a boiling point elevation of 0.104 K. What is the molar mass of the solute? (Kb for water = 0.52 K kg mol⁻¹)