Reactions energy of activation

Although it is not universally true that the activation energies of reactions parallel their heats of reaction, this is approximately true for the kind of addition reaction we are discussing. Accordingly, we can estimate E = k AH, with k an appropriate proportionality constant. If we consider the difference between two activation energies by combining this idea with Eq. (7.21), the contribution of the nonstabilized reference reaction drops out of Eq. (7.21) and we obtain... 

Table VI. Rates and Activation Energies of Reactions of B-Chlorosulfides...

E Activation energy of reaction (kJ kmol 3), or entrainer flowrate in azeotropic and extractive distillation (kg-s, kmol s-1), or extract flowrate in liquid-liquid extraction (kg s-1, kmol-s-1), or stage efficiency in separation (-)... 

Using PMO theory, it is possible to estimate the relative activation energy of reactions by assuming some reasonable structure for the transition state and then using perturbation theory to calculate the difference between the energy of the transition state and the energy of the reactants.(130)... 

As simple catalysts which reduce the activation energy of reactions... 

E activation energy of reaction in Arrhenius equation of reaction rate constant kJ moU1... 

Rate Constants and Activation Energies of Reaction RH + 03 —> R + HO3 in the Hydrocarbon Solution Calculated by the IPM Method (see Chapter 4, [133])... 

The quantum-chemical calculation of the activation energies of reactions EtOO + EtH and EtOO + EtOH by the DFT method supports this result [54]. For the reaction of EtOO with ethane, the calculated E value is 82 kJ mol-1, AH = 76 kJ mol-1, and Ee0 = 56 kJ mol-1. For the reaction of EtOO with ethanol is = 52.7. The structure of TS is presented in Figure 7.1. 

Reaction Enthalpy and Polar Interaction as Factors that Influence on Activation Energy of Reaction R02 + Ether (Equation [6.32])... 

Rate Constants and Activation Energies of Reactions RC(0)H + 02 Free Radicals and 2RC(0)H + 02 —> Free Radicals... 

Reaction (5) was not included in the mechanism originally suggested by Price and Trotman-Dickenson46. A more recent study of the thermal decomposition of dimethyl zinc in a benzene carrier system54 gave C6H5ZnCH3 as a major product. The activation energy of reaction (10) has been shown to be approx-... 

Adopting the same notation developed in the previous section, the reaction rates of isotopically heavy and light molecules are related to the differences in their respective activation energies of reaction E E°, through... 

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