reduces to the Langmuir isotherm.

c$)$ The decomposition of ammonia on solid surface is inhibited by the adsorption of hydrogen to the substrate. Assuming that the adsorption of a gas simply limits the number of surface sites available for adsorption, derive expressions for the fractional coverage of $H_2$ and $N{H}_3.$

$[3]$

$2N{H}_3=N_2+3H_2$