89.5 Arrhenius equation 9.5.11 modification of Arrhenius equation E=mRT+e However for some reaction such as rT 2 44 kJ mol-I CCl3 COOH>CHCI3+CO2, m=-107 m, usually be 0, 1, 2, 1/2,etc,is CH, Br +ho>CHoh +H++ Br very large m=-34.3 In a relatively small temperature The effect of temperature on the activation range, Ea seems independent on energy of these reactions is too large to ignore temperature Temperature-dependence of em, usually be 0, 1, 2, 1/2, etc., is not very large. In a relatively small temperature range, Ea seems independent on temperature. Ea = mRT + Ec However, for some reaction such as: CCl3COOH → CHCl3 + CO2 , m = -10.7 CH3Br + H2O → CH3OH + H+ + Br− , m = -34.3 The effect of temperature on the activation energy of these reactions is too large to ignore. Temperature-dependence of Ea RT= 2.44 kJ mol-1 9.5.11 modification of Arrhenius equation §9.5 Arrhenius equation