When a reaction mechanism is given, the rate law can be determined using the slow step in the reaction mechanism.
▪ rate law only involves the reactants
▪ the coefficients of the reactants in the slow step are the order of the reaction with respect to that reactant
▪ Rate Law has a general form of:
The reaction of CO with Cl2 gives phosgene (COCl2), a nerve gas that was used in World War I. Use the mechanism shown here to complete the following exercises:
Cl2 (g) ⇌ 2 Cl (g) (fast, k1 represents the forward rate constant, k−1 the reverse rate constant)
CO(g) + Cl(g) ⟶ COCl(g) (slow, k2 the rate constant)
COCl(g) + Cl(g) ⟶ COCl2 (g) (fast, k3 the rate constant)
(d) Write the overall rate law expression.
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