Ammonia is produced in the Haber process through the balanced reaction N2 + 3H2 -> 2NH3 (read: N two plus three H two yields two N H three), which has a change in enthalpy of -92 kilojoules per mole. Given that the forward reaction has an activation energy of 30 kilojoules per mole, what is the activation energy of the reverse reaction in kilojoules per mole?