For an endothermic reaction AH° = Ef - Eb is positive and K increases with temperature, where Ef and Eb are the activation energies for the forward and backward reactions, respectively. For an exothermic reaction AH° is negative and K decreases as the temperature is increased. The heat of reaction is -AH° and is thus positive for an exothermic reaction, and energy is released in the forward reaction. The forward reaction rate constant can then be written din kf Ef
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