In the reaction C(s)+CO2(g)⇌2CO(g), the equilibrium pressure is 12 atm. If 50% of CO2 reacts till equilibrium then Kp will be :
C(s)+CO2(g)⇔2CO(g)
P−P3 2P3
Ptotal=4P3=12(P=9)
So KP=(2P/3)2P(P/3)=626=6atm.