For the slow step in a reaction mechanism, the potential energy of the products is 110. kJ, the potential energy of the reactants is 80. kJ, and the potential energy of the transition state species is 200. kJ.

Draw a reaction profile for this elementary step. See video at 2:33.

What are the activation energies for the forward and reverse reactions? 90 kJ

What is the enthalpy for the forward reaction? +30 kJ (endothermic)