The Destruction of the Ozone Layer by Chlorofluorocarbons Can Be

question 3

Short Answer

The destruction of the ozone layer by chlorofluorocarbons can be described by the following reactions, all occurring in the gas phase. $$\begin{array} { l l } \mathrm { ClO } + \mathrm { O } _ { 3 } \rightarrow \mathrm { Cl } + 2 \mathrm { O } _ { 2 } & \Delta H _ { \mathrm { rxn } } ^ { \circ } = - 29.90 \mathrm {~kJ} \\2 \mathrm { O } _ { 3 } \rightarrow 3 \mathrm { O } _ { 2 } & \Delta H _ { \mathrm { rxn } } = \\\mathrm { Cl } + \mathrm { O } _ { 3 } \rightarrow \mathrm { ClO } + \mathrm { O } _ { 2 } & \Delta H _ { \mathrm { rxn } } = 54.08 \mathrm {~kJ}\end{array}$$
What is $\Delta$ H°_rxn for the decomposition of ozone to oxygen?

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