We can do this by adding the two steps of the mechanism together. The first step is $\mathrm{NO}_{2}(g)+\mathrm{Cl}_{2}(g) \longrightarrow \mathrm{Cl}(g)+\mathrm{NO}_{2}(g)$ and the second step is $\mathrm{NO}_{2}(g)+\mathrm{Cl}(g) \longrightarrow
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