A liquid is in equilibrium with its vapour in a sealed container … - Vidyadip

Question

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?

✓

Answer

(a) The volume of vessel is increase. Hence, initially the vapour pressure will decrease.
(b) The rate of evaporation will increase as more space becomes available due to increase in volume but rate of condensation will decrease.
(c) When equilibrium is re-established, the rate of evaporation and rate of condensation will become equal and ultimately the same vapour pressure will be established because the vapour pressure of every liquid is fixed at fixed temperature.

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