Concentration units, Raoult's law, colligative properties, abnormal molar mass, van't Hoff factor.
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Q1 · Solutions · EASY
A solution is prepared by dissolving 5.85 g of NaCl in 500 g of water. What is the molality of the solution? (Molar mass of NaCl = 58.5 g/mol)
Q2 · Solutions · MEDIUM
Two liquids A and B form an ideal solution. At 300 K, the vapour pressure of pure A is 400 mm Hg and that of pure B is 600 mm Hg. If the mole fraction of A in the liquid phase is 0.4, what is the mole fraction of A in the vapour phase above the solution?
Q3 · Solutions · MEDIUM
A solution containing 0.5 g of a non-volatile solute in 100 g of water boils at 100.052 °C at 1 atm pressure. What is the approximate molar mass of the solute? (Kb for water = 0.52 K kg/mol)
Q4 · Solutions · HARD
A 0.01 m aqueous solution of K3[Fe(CN)6] freezes at -0.062 °C. What is the van't Hoff factor (i) for this solution? (Kf for water = 1.86 K kg/mol)
Q5 · Solutions · MEDIUM
A 5% solution of glucose (molecular mass 180 g/mol) is isotonic with a 2% solution of substance X. The molecular mass of X is approximately: