Problem: A certain reaction has a ΔH = –75 kJ and an activation energy of 40 kJ. A catalyst is found that lowers the activation energy of the forward reaction by 15 kJ. What is the activation energy of the reverse reaction in the presence of this same catalyst?(A) 25 kJ(B) 60 kJ(C) 90 kJ(D) 100 kJ

FREE Expert Solution
87% (79 ratings)
FREE Expert Solution

We’re being asked to determine the activation energy for the catalyzed reverse reaction.


We’re given the following information:


ΔH = –75 kJ: Recall that the change in enthalpy (ΔH) is the difference in energy between products and reactants. ΔH for the reaction is negative, which means we have an exothermic reaction. This signifies that the reactants are higher in energy than the products.


87% (79 ratings)
View Complete Written Solution
Problem Details

A certain reaction has a ΔH = –75 kJ and an activation energy of 40 kJ. A catalyst is found that lowers the activation energy of the forward reaction by 15 kJ. What is the activation energy of the reverse reaction in the presence of this same catalyst?

(A) 25 kJ

(B) 60 kJ

(C) 90 kJ

(D) 100 kJ

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Energy Diagram concept. If you need more Energy Diagram practice, you can also practice Energy Diagram practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofA certain reaction has a ΔH = –75 kJ and an activation energ...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Jules took 3 minutes and 40 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Mosley's class at UC.