A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased. (a) What is the initial effect of the change on vapour pressure? (b) How do rates of evaporation and condensation change initially? (c) What happens when equilibrium is restored finally and what will be the final vapour pressure?
(a) Vapour pressure decreases since equilibrium is disturbed and the rate of condensation falls considerably. (b) Rate of evaporation increases while that of condensation falls initially. (c) On restoration of the equilibrium again, the vapour pressure becomes the same.