115b_exam1key_07

115b_exam1key_07 - Chem 115b Spring 2007 Exam 1 Professor...

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Chem 115b Spring 2007 Print Name: Last First Exam 1 Last 3 digits of Student ID # January 25, 2007 TA's Name P r o f e s s o r R e i s l e r M a j o r Questions Points Score Grader 1 15 2 10 3 12 4 10 5 14 6 15 7 12 8 12 Total 100 INSTRUCTIONS 1. YOU MUST SHOW YOUR WORK TO RECEIVE CREDIT. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST USE BLACK INK TO BE ABLE TO REQUEST A REGRADE 4. Please read each question carefully before you write your answer. 5. There are 8 questions on 6 pages. ± Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature:
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1 1. (15 pts) The rate of the reaction between CO and NO 2 CO(g) + NO 2 (g) CO 2 (g) + NO(g) was studied starting with various concentrations of CO and NO 2 and the data in the table were collected. Initial Concentrations Initial Rate Experiment [CO], mol/L [NO 2 ], mol/L (mol/L·s) 1 5.10 x 10 -4 0.700 x 10 -4 6.8 x 10 -8 2 5.10 x 10 -4 0.175 x 10 -4 1.7 x 10 -8 3 10.2 x 10 -4 0.350 x 10 -4 6.8 x 10 -8 (a ) (10 pts) From the data above, determine the differential rate equation and the exponents. 2 [] [ ] mn dCO R kCO NO dt =− = A. From experiments (1) and (2) we get that when [NO2] increases by x4, the rate increases by x4. Therefore: n =1 B. From experiments (2) and (3) Which gives m =1 2 [ ] R kCO NO dt = (b) (5 pts) What is the value of the rate constant for this reaction?
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115b_exam1key_07 - Chem 115b Spring 2007 Exam 1 Professor...

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