Two proposed mechanisms convert A → B.
Mechanism A: highest transition state is 80 kJ·mol⁻¹ above the reactants, and the products are −30 kJ·mol⁻¹ relative to the reactants.
Mechanism B: highest transition state is 60 kJ·mol⁻¹ above the reactants, and the products are −10 kJ·mol⁻¹ relative to the reactants.
At the same temperature, which mechanism is expected to give the faster overall rate, and which mechanism is more exothermic? State both answers.