## Chemistry and Chemical Reactivity (9th Edition)

a) $\begin{matrix} NO_2(g)&+&\underline{\underline{NO_2(g)}}&\rightarrow&NO(g)&+&\underline{NO_3(g)} \\ \underline{NO_3(g)}&+&CO(g)&\rightarrow&\underline{\underline{NO_2(g)}}&+&CO_2(g) \\ \hline NO_2(g)&+&CO(g)&\rightarrow&NO(g)&+&CO_2(g) \end{matrix}$ b) Both steps are bimolecular (two molecules exchange atoms). c) $NO_3$ is an intermediary to this reaction since it's not a part of the global reactants or products.