A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased.
How do rates of evaporation and condensation change initially?

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Solution

In the closed vessel at constant temperature, the rate of evaporation will remain constant. Initially, the rate of condensation will be lower as lesser number of molecules per unit volume are present in the vapour phase.
Due to this, the number of collisions per unit volume with the liquid face decreases.

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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 liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased.

What is the initial effect of the change on vapour pressure?

How do rates of evaporation and condensation change initially?

What happens when equilibrium is restored finally and what will be the final vapour pressure?

Assign oxidation numbers to the underlined elements in each of the following species:
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$H_{4} {P - -}_{2} O_{7}$

$K_{2} M n - -- - O_{4}$

$C a {O - -}_{2}$

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