The reaction A+B rarr AB has an enthalpy...

The reaction `A+B rarr AB` has an enthalpy of reaction of -85.0 KJ-`"mol"^(-1)` . If the activation ehthalpy for the forward reaction is 120.0 KJ `"mol"^(-1)` , What is the activation energy for the reverse reaction `AB rarr A+B?`

35.0 KJ .`"mol"^(-1)`

85.0 KJ .`"mol"^(-1)`

12.0 KJ .`"mol"^(-1)`

205.0 KJ .`"mol"^(-1)`

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