Phosgene (COCl2) is a nasty gas used occasionally in warfare. It blisters your lungs! Consider the following thermodynamic data:

COCl2(g) CO(g) + Cl2(g)

at 600 K, Kp is 1.2 103 . If you put 0.7 atm of COCl2(g) into a vessel of fixed volume and hold the temperature at 600 K, what is the equilibrium pressure of Cl2(g)? You must use a quadratic to solve this.