Chemistry - Chemical Equilibrium Question with Solution | TestHub

The equilibrium constant, ${\mathrm{K}}_{\mathrm{p}}$ for the reaction $2{\mathrm{SO}}_2(\mathrm{g})+{\mathrm{O}}_2(\mathrm{g})\rightleftharpoons 2{\mathrm{SO}}_3(\mathrm{g})$ is $4{\mathrm{atm}}^{-1}$ at 1000 K . What would be the partial pressure of ${\mathrm{O}}_2$ if at equilibrium the moles of ${\mathrm{SO}}_2$ and ${\mathrm{SO}}_3$ is the same?