89.5 Arrhenius equation 9.5.5 E and energy change of reaction E E E Ea+-Ea-=Up-Ck=△C the difference of thermodynamic energy △U=E-E reactant, product, activated molecule reaction path When ea ea+ Au<0, the reaction is principle of micro-reversibility exothermic9.5.5 Ea and energy change of reaction Ea,+ =Ua −UR Ea,− =Ua −UP reactant, product, activated molecule, reaction path. U = Ea,+ − Ea,− When Ea,->Ea,+, U < 0, the reaction is exothermic. Ea,+ − Ea,− =UP −UR = U the difference of thermodynamic energy §9.5 Arrhenius equation principle of micro-reversibility