Calculate Kp for each of the following reactions.

N2O4 (g) ⇌ 2 NO2 (g) Kc = 5.9×10^−3 (at 298 K).
N2 (g) + O2 (g) ⇌ 2 NO (g) Kc = 4.10×10^−31 (at 298 K)