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Topic: activation energy to enthalpy  (Read 3908 times)

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Offline jubba

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activation energy to enthalpy
« on: January 26, 2006, 09:35:37 PM »
does Ea for the reverse reaction - Ea for the forward reaction = enthalpy change for that reaction?

Byrne

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Re:activation energy to enthalpy
« Reply #1 on: January 27, 2006, 11:02:54 PM »
does Ea for the reverse reaction - Ea for the forward reaction = enthalpy change for that reaction?

That is correct.  In an exothermic reaction, remember that the Ear will be a negative value.  If Ear is a positive value, the reaction is in the endothermic direction.  If you're having trouble understanding why this is, draw a potential energy diagram or just view one at the following linl:

http://www.saskschools.ca/curr_content/chem30/modules/module4/lesson4/potentialenergydiagram.htm
« Last Edit: January 27, 2006, 11:18:55 PM by Byrne »

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