A reaction takes place in two steps. The rates of the two elementary steps are given. On the basis of these, predict the rate of reaction with changes in concentration. Also the given units of rate constant are
`2A_((g)) + B_(2(g)) to 2AB_((g)) to `Overall reaction
`A + B_(2) to AB+B` in the first step, r`=3.2xx10^(4)` mol `L^(-1) s^(-1)`
`B + A to AB`, in the second step , `r=1.9xx10^(6) ` mol `L^(-1)s^(-1)`

Explanation

(i) rate-determining step of a reaction
(ii) determination of rate law on the basis of stoichiometry of the rate-determining step
(iii) determination of change in rate of reaction with the change of concentration of the reactions from rate law
(iv) determination of the unit of rate constant from rate law