Answer:Overall equation:
a)CO(g) + NO2(g) → CO2(g) + NO(g)
b)Each step is bimolecular
c)Rate=k[NO2]^2
d)NO3 is an intermediate
Explanation:
To obtain the overall rate equation we cancel out reactants and products that are the same on both sides of the both steps. This leaves us with CO(g) + NO2(g) → CO2(g) + NO(g) as the overall stoichiometric reaction equation. Each step involves the reaction of two molecules hence each step in the mechanism is bimolecular. The slow step involves the reaction of NO2 hence the rate of reaction depends on the first step of the reaction hence the rate equation shown in the answer. Intermediates only take part in elementary steps but do not appear as products or reactants. They are produced and consumed transiently. NO3 is an intermediate in this reaction.