posted by amanda on .
An endothermic reaction was found to have an activation energy of 100 kJ. If this reaction is reversed, the activation energy is only 20 kJ. What is the value of delta H for the endothermic reaction?
For an endothermic reaction, Ea forward = Ea reverse + delta E rxn.
So the answer would be positive 120 kJ?
No. If Ea forward is 100 and Ea reverse is 20, then delta E reaction is 80.
I looked for and count not find a good diagram. Finally I succeeded.
You can see that 40 + 30 = total = 70 for exothermic and equally you see that 100 = total = 20 + 80