Henry's law; Raoult's law; ideal solutions; colligative properties — lowering of vapour pressure, elevation of boiling point, depression of freezing point, osmotic pressure; van't Hoff factor.
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Q1 · Solutions · MEDIUM
An aqueous solution containing 2.50 g of a non-volatile, non-electrolyte solute in 150 g of water boils at 100.26°C at 1 atm pressure. If K_b for water is 0.52 K kg mol⁻¹, what is the molar mass of the solute (in g mol⁻¹)?
Q2 · Solutions · HARD
At 298 K, the vapor pressure of pure benzene is 0.256 bar and that of pure toluene is 0.0925 bar. An ideal solution is prepared by mixing benzene and toluene such that the mole fraction of benzene in the liquid phase is 0.40. What is the mole fraction of benzene in the vapor phase?
Q3 · Solutions · EASY
A solution is prepared by dissolving 6.0 g of urea (Molar mass = 60 g/mol) in 90 g of water. What is the molality (in mol/kg) of the solution?
Q4 · Solutions · MEDIUM
An aqueous solution containing 6.84 g of a non-volatile solute in 250 g of water has a vapor pressure of 23.5 mmHg at 298 K. The vapor pressure of pure water at this temperature is 23.8 mmHg. If the molar mass of the solute is approximately 171 g/mol, which of the following represents the correct relationship for this system?
Q5 · Solutions · HARD
A 0.2 molal aqueous solution of a weak acid (HA) is 25% dissociated. If Kf for water is 1.86 K kg mol⁻¹, the freezing point of the solution (in °C) will be approximately: