Question

It has been proposed that the conversion of ozone into $O_2$ proceeds in two steps:
$O_{3\left(g\right)}\rightleftharpoons O_{2\left(g\right)}+O_{\left(g\right)}$
$O_{3\left(g\right)}+O_{\left(g\right)}\to 2O_{2\left(g\right)}$
(a) Write the equation for overall reaction.
(b) Identify the intermediate, if any.
(c) Derive molecularity for each step of mechanism.

Answer 1

(a) Addition of the two steps gives the overall reaction:

$2O_{3\left(g\right)}\to 3O_{2\left(g\right)}$

(b) Since the $O_3$ is reactant and $O_2$ is product, hence intermediate is $O_{\left(g\right)}$.

(c) The first step is unimolecular and the second step is biomolecular.