# The rate constant for the second order reaction

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8.The rate constant for the second-order reaction2NOBr(g) → 2NO(g) + Br2(g)is 0.80/M · s at 10ºC. a)Starting with a concentration of 0.086 M, calculate the concentration of NOBr after 22 s.(5 points)
1 .
0
1 .
b)Calculate the half-lives when [NOBr]
1
.
9.Define activation energy. What role does activation energy play in chemical kinetics?(5points)
10. Given the same reactant concentrations, the reactionCO(g) + Cl2(g) → COCl2(g)at 250°C is 1.50 × 103times as fast as the same reaction at 150°C. Calculate the activationenergy for this reaction. Assume that the frequency factor is constant. (Hint: use equation13.14.) (10 points)
11. Most reactions, including enzyme-catalyzed reactions, proceed faster at higher temperatures.However, for a given enzyme, the rate drops off abruptly at a certain temperature. Accountfor this behavior. (5 points)