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SP 08 Final Exam - CHM2045(early Final Exam Spring 2008...

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CHM2045 (early) Final Exam Spring 2008 Form Code A READ THESE INSTRUCTIONS COMPLETELY: Please bubble in your name, CHM2045 section number, UF ID (leave one space at the end, no hyphen) and the test form code above. Incomplete or incorrect information will result in an unrecoverable loss of score. Read the entire exam and answer the following 27 questions for a total of 300 points in the context and conventions of our lectures. Work alone. Late papers will not be collected. Good Luck! Your name on the answer sheet states the assertion: I hereby pledge that I have neither given nor received unauthorized aid during this exam 1. Consider the reaction and rate data: 2NO(g) + Cl 2 (g) 2NOCl(g) Exp [NO] [Cl 2 ] Rate (x 10 6 mol/L . s) The experimentally determined rate equation (Rate = ) for this reaction is: (a) k [NO][Cl 2 ] (b) k [NO] (c) k (d) k [NO][Cl 2 ] 2 (e) k [NO] 2 [Cl 2 ] 1 0.250 0.250 1.43 2 0.500 0.250 5.72 3 0.250 0.500 2.86 4 0.500 0.500 11.4 2. If the reaction, 2A + B C , proceeds by the mechanism: A + B D (fast) A rate law (Rate = ) consistent with this mechanism is: D + B E (slow) E + A C + B (fast) 3. The dimerization of tetrafluoroethylene (C 2 F 4 ) to octafluorocyclobutane (C 4 F 8 ) is second order in reactant, C 2 F 4, and second order overall. At 450 K, the rate constant k = 0.0448 L mol 1 s 1 . If the initial concentration of C 2 F 4 is 0.100 M, the initial half-life is closest to: 4. A solution prepared from 360. mg of a sugar (ideal nonelectrolyte) in 1.00 g of water freezes at 3.72 o C. (For water, K fp = 1.86 K/m, and the normal freezing point is 0.00 o C) What is the molar mass of this sugar? 5. The data shown are for the reaction: 2H 2(g) + 2NO (g) → 2H 2 O (g) + N 2(g) . Experiment [H 2 ] [NO] Rate (M/s) What is the closest value to the missing rate
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