Equilibrium Constant Calculation for N2O5

37.8 g N₂O₅ was taken in a 1 L reaction vessel and allowed to undergo the following reaction at 500 K
2N₂O_5(g) → 2N₂O_4(g) + O_2(g)
The total pressure at equilibrium was found to be 18.65 bar. Then, Kp = _______ × 10^–2 [nearest integer] Assume N₂O₅ to behave ideally under these conditions
Given : R = 0.082 bar L mol^–1 K^–1