Consider the reaction, ${\mathrm{N}}_2\left(g\right)+3{\mathrm{H}}_2\left(g\right)\rightleftharpoons 2{\mathrm{NH}}_3\left(g\right)$. The equilibrium constant of the above reaction is $\mathrm{K}p$. If pure ammonia is left to dissociate, the partial pressure of ammonia at equilibrium is given by (Assume that ${\mathrm{P}}_{{\mathrm{NH}}_3}<<{\mathrm{P}}_{\text{total }}$ at equilibrium)