The reaction N 204(8) 2NO 2(8) has a Kp = 0.140 at 25 C. In a reaction vessel containing the gases in equilibrium at that temperature, the partial pressure of N204 was 1.26 bar. What was the partial pressure, in bar, of NO2 in the reaction mixture? O A 0.42 OB 0.56 , 0.68 OD 0.77