The compound nitrosyl bromide, NOBr , can be formed as shown in reaction 3 . reaction 3 $$\[ 2 \mathrm{NO}(\mathrm{g})+\mathrm{Br}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{NOBr}(\mathrm{g}) \]$$ The rate is first order with respect to $$\([\mathrm{NO}]\)$$ and first order with respect to $$\(\left[\mathrm{Br}_{2}\right]\)$$. The reaction mechanism has two steps. Suggest equations for the two steps of this mechanism. State which is the rate-determining step. step 1 .................................................................................................................................... step 2 .................................................................................................................................... rate-determining step $$\(=\)$$ ...........................

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