110 exam 3

110 exam 3 - 1 SPRING 2006 CHEM 110 EXAM 3 SHOW ALL WORK NO...

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1. (15 pts) (a) The rate law for the following reaction is rate = k [NO] 2 [O 2 ]: 2 NO + O 2 → 2 NO 2 The following mechanism for this reaction has been proposed: Step 1 (fast): 2 NO N 2 + O 2 Step 2 (slow): N 2 + 2 O 2 → 2 NO 2 Is this mechanism a possibility? Justify your answer. (b) The reactions of NO 2 have been studied as a function of temperature. For the following decomposition reaction, the rate constant is 2.7 x 10 –2 M –1 s –1 at 227 ºC and 2.4 x 10 –1 M –1 s –1 at 277 ºC. 2 NO 2 → 2 NO + O 2 Calculate the activation energy for the reaction. E a = _______________ (c) Consider the graphs below and answer the following questions: (i) Which of the following has the largest activation energy for the reverse reaction? (1) I (2) II (3) III (4) I and II (5) I and III (6) II and III (ii) Which of the following is endothermic (forward reaction)? (1) I (2) II (3) III (4) I and II (5) I and III (6) II and III (iii) Which of the following is exothermic (forward reaction)? (1)
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This test prep was uploaded on 04/12/2008 for the course MODL 398 taught by Professor Amano during the Spring '08 term at UNL.

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110 exam 3 - 1 SPRING 2006 CHEM 110 EXAM 3 SHOW ALL WORK NO...

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