1.
The dissociation equilibrium of a gas AB2_2 can be represented as:
2AB2(g)2AB(g)+B2(g)\mathrm{2AB_2(g) \rightleftharpoons 2AB(g) + B_2(g)}

The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant Kp_p and total pressure p is: