Chapter 15, Problem 76AP

When heated, ammonium carbamate decomposes as follows:

${\text{NH}}_{\text{4}}{\text{CO}}_{\text{2}}{\text{NH}}_{\text{2}}\text{(s)}\stackrel{}{\rightleftarrows }{\text{2NH}}_{\text{3}}{\text{(g)+CO}}_{\text{2}}\text{(g)}$

At a certain temperature, the equilibrium pressure of the system is 0.318 atm. Calculate $K_p$ for the reaction.