CHEMISTRY · Single correct · AP · Chemistry · Kinetics · Kinetics
Problem
A two-step mechanism has the following energetics, given relative to the reactants: Step 1 is endothermic by 15 kJ, and Step 2 is exothermic by 50 kJ. Which statement best describes the qualitative shape of the overall energy profile?
(a) The profile has two peaks separated by one valley, and the final valley lies 65 kJ below the reactants.
(b) The profile has two peaks separated by one valley, and the final valley lies 35 kJ below the reactants.
(c) The profile has two peaks separated by one valley, and the final valley lies 35 kJ above the reactants.
(d) The profile has one peak and one valley, and the final valley lies 35 kJ below the reactants.