Answer the following questions: (a) The elevation in boiling point for 1 molal solution of non-volatile solute A is 3K and the depression in freezing point for 2 molal solution of A in the same solvent is 6K. What is the ratio of Kb and Kf? (1 mark) (b) A gaseous mixture of two s

Question

Answer the following questions: (a) The elevation in boiling point for 1 molal solution of non-volatile solute A is 3K and the depression in freezing point for 2 molal solution of A in the same solvent is 6K. What is the ratio of Kb and Kf? (1 mark) (b) A gaseous mixture of two substances A and B, under a total pressure of 0.8 atm is in equilibrium with an ideal liquid solution. If the mole fraction of substance A is 0.5 in the vapour phase and 0.2 in the liquid phase, then calculate the vapour pressure of pure liquid A. (2 marks)

Accepted Answer

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> [!TLDR]
> (a) Divide each colligative property change by its molality to get Kb and Kf, then compare. (b) Use Dalton's law to get A's partial pressure from the vapour, then Raoult's law to get its pure vapour pressure.
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> **(a) Ratio of $K_b$ to $K_f$:**
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