Consider a hypothetical chemical reaction: A+B+C+D (In this equation A, B, C and D stand for some unknown chemical formulas.) Here is an energy diagram for the reaction: 400 300 energy (kJ/mol) 200 A + B 100 C + D 0 reaction coordinate Use the energy diagram to answer these questions. What is the heat of reaction? kJ/mol Exothermic Endothermic Is the reaction exothermic or endothermic? O Neither O Yes, it's ] kJ/mol Can you determine the activation energy? O No. Can you determine the activation energy of the reverse reaction? O Yes, it's [] kJ/mol C+D+ A+B O No. $