Help with reaction CO+NO2 = CO2 + NO and activation energy for reverse

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For the reaction CO+NO2 = CO2 + NO, the activation energy for the forward reaction is 135 Kj/mol of CO reacted. a) Determine the heat of the reaction. b) From the data given, and the delta Hr for the reaction, determine the activation energy for the reverse reaction. c) Draw and label a potential energy diagram for the reaction.