How is ozone formation form oxygen **spontaneous**?

[![enter image description here](https://i.stack.imgur.com/1fkvA.jpg)](https://i.stack.imgur.com/1fkvA.jpg)
DeltaH for process is positive and deltaS is negative. Then by thermodynamics,deltaG for process must be positive at all temperatures. Then how is ozone formation spontaneous?




It seems reasonable to suspect that some O2 molecules will dissociate in the discharge. Some of the resulting atoms will bond to other O2 to form O3 instead of recombining. To evaluate the thermodynamics of this process, one should therefore start at atomic oxygen.


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