# Is it possible that for a reaction, it's activation energy equals total enthalpy of reaction?

Is there any reaction for which activation energy equals total change in enthalpy for the reaction . Is it possible in the first place ? Are there any interesting examples relating this concept ?

• That would imply zero barrier for the reverse reaction, BTW. – Ivan Neretin Sep 24 '16 at 11:48
• What can we say about homolytic fission of... say chlorine molecule ? – Pyro Recorcinol Sep 24 '16 at 11:49
• Yeah, maybe something like that. – Ivan Neretin Sep 24 '16 at 12:10
• So we can say that activation energy for homolytic fission is same as enthalpy change for overall reaction ? It's confusing – Pyro Recorcinol Sep 24 '16 at 12:12
• @getafix any help ? – Pyro Recorcinol Sep 24 '16 at 12:12

$$\ce{O2N-NO2 -> 2NO2}$$