In the given chemical equilibrium, D2(g) + H2(g) ⇌ 2DH(g), with Kp = 1.80 at 298 K, if ΔHrxn° is 0.32 kJ/mol DH, calculate Kp at 500 K.
a) 1.89
b) 2.01
c) 1.65
d) 1.42