18. The rate constants, at two different temperatures, for the reaction CH3I + Br- ® CH3B + I- are given below. t= 30°C k = 1.38 x 10-4 M-1s-1 k = 1.21 x 10-3 M-1s-1 t = 49°C What is the activation energy for this reaction? R = 8.314 J/molxK. a) 92.7 kJ/mol d) 343 kJ/mol b) 200 kJ/mol e) none of these c) 40.3 kJ/mol

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