CHEMISTRY · Single correct · AP · Chemistry · Kinetics · Kinetics
Problem
For the second step of a reaction mechanism, the following energies are measured relative to the reactant of that step (an intermediate formed earlier):
• Energy of intermediate (reactant for step 2): 15 kJ
• Energy of transition state: 65 kJ
The enthalpy change for step 2 is ΔH₂ = −45 kJ.
What is the activation energy for the reverse of step 2?
(a) 50kJ
(b) 110kJ
(c) 95kJ
(d) 20kJ