Question
The reaction:
2NO + Br2 → 2NOBr
is supposed to follow the following mechanism.
(i)
(ii)
Suggest the rate law expression.
Solution
The rate expression is derived by step II of the mechanism, as it is the slower one
rate = k[NOBr2][NO] ...(i)
However, NOBr2 is an intermediate and thus its concentration should be replaced from equation (i)
From step (i),
Equilibrium constant,
...(ii)
Then by equation (i) and (ii)
Order of the reaction is 2+1 =3
