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Change in Enthaply and Activation Energy

  1. Feb 14, 2015 #1
    1. The problem statement, all variables and given/known data

    For a reaction that is exothermic in the forward direction, can the activation energy Ea(fwd) ever be less than the enthalpy change?

    2. Relevant equations

    Endothermic equation: Ea(rev) = Ea(fwd) - deltarH

    3. The attempt at a solution

    The answer in the book has "yes", but I don't know how this can be true.

    Since it's an exothermic reaction, deltarH is negative. And as far as I know, the forward activation energy must be positive. Is it possible that the book meant magnitude? If so, then I could understand why they gave that answer.
  2. jcsd
  3. Feb 15, 2015 #2


    User Avatar

    Staff: Mentor

    That would be my understanding.
  4. Feb 15, 2015 #3
    :smile: Thanks!
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