A researcher measures the potential energy (in kJ mol−1) for an elementary, gaseous dissociation reaction along the reaction coordinate and obtains the following values relative to an arbitrary zero reference: reactants = 35, transition state = 75, products = 10.
(a) Sketch a qualitative reaction-coordinate diagram based on the data. Clearly label the reactants, products, transition state, Ea for the forward process, Ea for the reverse process, and ΔE.
(b) Identify whether the reaction is endothermic or exothermic. Justify your answer using the numerical information provided.
(c) Compare the magnitudes of the forward and reverse activation energies. Predict which direction (formation of products or re-formation of reactants) will proceed at a faster intrinsic rate at the same temperature, and explain your reasoning.