Achieve Question 17

[005917072]

A certain reaction has an enthalpy of ΔH = 59 kJ and an activation energy of Ea = 96 kJ.
What is the activation energy of the reverse reaction?

I was able to figure out that I had to 96 kJ - 59 kJ, so 37 kJ, but I still don't understand why that's the answer? Why is Ea of a reverse reaction the difference between the forward reaction's Ea and the ΔH?

[Spencer T]

Because the enthalpy is negative, the reaction is exothermic.
We know that the enthalpy is the change in energy between the initial state and the final state. Using the equation = E_forward - E_reverse, we solve for E_reverse to get this equation.

E_reverse = E_forward -

[andrea guzman 1F]

HI the activation energy of the reverse reaction is Ea(forward) - H because it accounts for the energy need to go back of the Ea hill.