Chemical Equilibrium

At 500 K , for the reaction \(\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_3(\mathrm{~g})\), the \(K_p\) is \(0.036 \mathrm{~atm}^{-2}\). What is its \(K_C\) in \(\mathrm{L}^2 \mathrm{~mol}^{-1}\) ? \(\left(R=0.082 \mathrm{~L}^2\right.\) atom \(\left.\mathrm{mol}^{-1} \mathrm{~K}^{-1}\right)\).