Chemistry - Chemical Equilibrium Question with Solution | TestHub

The equilibrium constant $\left(K_p\right)$ for the reaction,

$2{\mathrm{SO}}_2(\mathrm{g})+{\mathrm{O}}_2(\mathrm{g})\rightleftharpoons 2{\mathrm{SO}}_3(\mathrm{g})$ at 1000 K is $3.5{\mathrm{atm}}^{-1}$

What would be the partial pressure of oxygen gas, if the equilibrium is found to have equal moles of ${\mathrm{SO}}_2$ and ${\mathrm{SO}}_3$ ?