Chemical Equilibrium

At equilibrium, the concentration of

$$\begin{gathered} \mathrm{N}_2=3.0 \times 10^{-3} \mathrm{M} \\ \mathrm{O}_2=4.2 \times 10^{-3} \mathrm{M} \\ \text{and} \quad \mathrm{NO}=2.8 \times 10^{-3} \mathrm{M} \end{gathered}$$

in a sealed vessel at \(800 \mathrm{~K}\) and \(1 \mathrm{~atm}\) pressure. What will be \(K_p\) for the given reaction?

\(\mathrm{N}_2(g)+\mathrm{O}_2(g) \rightleftharpoons 2 \mathrm{NO}(g)\)