The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and $\Delta$H$\degree$_rxn = + 55 kJ/mol. What is the activation energy for the reverse reaction?

Question

Quizplus · Accepted Answer

The activation energy for the reverse reaction can be found using the relationship:
∆H(reverse) = -∆H(forward)
Therefore, the activation energy for the reverse reaction is:
Ea(reverse) = Ea(forward) - ∆Hrxn
Ea(reverse) = 102 kJ/mol - (+55 kJ/mol) = 47 kJ/mol
Therefore, the best choice is B.

The Decomposition of Dinitrogen Pentaoxide Has an Activation Energy of 102