1.
The reaction of ozone with oxygen atoms in the presence of chlorine atoms can occur by a two-step process shown below:

O3(g)+Cl(g)→O2(g)+ClO(g)ki=5.2×109 L mol−1 s−1\text{O}_3\text{(g)} + \text{Cl(g)} \rightarrow \text{O}_2\text{(g)} + \text{ClO(g)} \qquad k_i = 5.2 \times 10^{9}\,\text{L mol}^{-1}\,\text{s}^{-1}


ClO(g)+O(g)→O2(g)+Cl(g)kii=2.6×1010 L mol−1 s−1\text{ClO(g)} + \text{O(g)} \rightarrow \text{O}_2\text{(g)} + \text{Cl(g)} \qquad k_{ii} = 2.6 \times 10^{10}\,\text{L mol}^{-1}\,\text{s}^{-1}


The closest rate constant for the overall reaction O3(g)+O(g)→2O2(g)\text{O}_3\text{(g)} + \text{O(g)} \rightarrow 2\text{O}_2\text{(g)} is: