390_Problem_Set_11 - Problem Set 11 Chem 3900: Physical...

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1 Problem Set 11 Chem 3900: Physical Chemistry II Spring 2009 “Grade it yourself” The solution will be posted online on Tuesday, 5 th May. There is no due for this assignment and your work will not be graded. Instead, you’re encouraged to finish this PS to prepare for the Final that will be held on 12 th May. Final: CHEM 3900 Tuesday, May 12 2:00 PM Plant Science Building 233 Problem 1. Use collision theory to compute an upper limit for the rate constant of the reaction NO(g) + O 3 (g) NO 2 (g) + O 2 (g) (1) at T = 300K. Take d NO = 0.28 nm, d O3 = 0.40 nm. The measured pre-exponential factor is 1.0×10 8 L mol 1 s 1 . Compare this result to your previous answer. What does this comparison tell you about this reaction? Problem 2 . Use transition state theory to determine the dependence of the Arrhenius A factor on temperature T for the following gas-phase reactions: O + O O 2 (2a) O + O 3 2O 2 (2b) NO + O 3 NO 2 + O 2 (2c) Assume that h ν << k B T for all vibrations, and that the transition states for reactions (2b), (2c) are
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390_Problem_Set_11 - Problem Set 11 Chem 3900: Physical...

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