At a certain temperature and total pressure of 10^5Pa, iodine vapour contains 40percent by volume of I atoms. Calculate Kp for the equilibrium.

Question

At a certain temperature and total pressure of 10⁵ Pa, iodine vapour contains 40% by volume of I atoms

Calculate Kp for the equilibrium.

Answer 1

Partial pressure of I atoms, 

Partial pressure of I₂ molecules, 

Now, for the given reaction, 

Answer 2

Total Pressure,P=10⁵ Pa
As 40 % molecules are I atoms 60% are I₂ molecules.
Partial pressure of I(g),p_I =0.4 x 10⁵ Pa
Partial pressure of I₂ (g),p_I2 =0.6 x 10⁵ Pa