89.5 Arrhenius equation 9.5.6 Tolman's definition ofE E=E-E The minimum energy that the molecules must absorb before the E=E-E reaction can take place is known as the activation energy according to Tolman, the activation energy P of elementary reaction is the difference between the average energy of the activated molecules and the average energy of total molecules Boltzmann distribution9.5.6 Tolman’s definition of Ea The minimum energy that the molecules must absorb before the reaction can take place is known as the activation energy. Ea = E − E * Boltzmann distribution According to Tolman, the activation energy of elementary reaction is the difference between the average energy of the activated molecules and the average energy of total molecules: Ea = E − E * §9.5 Arrhenius equation