One of the concerns about the use of Freons is that they will migrate to the upper atmosphere, where chlorine atoms can be generated by the reaction

Chlorine atoms can also act as a catalyst for the destruction of ozone. The activation energy for the reaction Cl + O3 †’ ClO + O2 is 2.1 kJ/ mol. Which is the more effective catalyst for the destruction of ozone, Cl or NO? (See Exercise 88.)

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