The decomposition reaction 2HI(g)H2(g)+I2(g), is second order and has a rate constant equal to 1.6 r 103M1s1 at 700C. If the initial concentration of HI in the container is 3.4102M, how many minutes will it take for the concentration to be reduced to 8.0104M ? The conversion of cyclopropane to propylene is first order and has a rate constant of 1.3106s1 at 400C. The rate constant is 1.1105s1 at 430C. What is the activation energy in kJ/mol