Consider the following reaction.
CO(g) + Cl2 (g) > COCl2 (g)
The mechanism is believed to be,
(1) Cl2 <> 2Cl (fast equilibrium)
(2) Cl + CO <> COCl (fast equilibrium)
(3) COCl + Cl2 > COCl2 + Cl (slow)
(4) 2 Cl > Cl2 (fast)
Assuming that the mechanism is correct, derive the rate law for this reaction.