At 1000\,K the reaction CO(g)+Cl2(g)⇌COCl2(g) has Kp=6.5. In a sealed vessel at this temperature the equilibrium partial pressures of CO and Cl2 are 0.25\,atm and 0.40\,atm, respectively. What is the equilibrium partial pressure of COCl2(g)?
a) 1.6atm
b) 0.25atm
c) 0.65atm
d) 0.10atm