Chem2080 2010 Prelim2 - Page 1 of 7 Chemistry 2080 - Spring...

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Page 1 of 7 Chemistry 2080 - Spring 2010 Prelim #2 Tuesday April 13th, 7:30 to 9:00 pm Name: _____________________________________ CU ID: ____________________ Last First M.I. Lab: _______________________________ Lab TA Name: __________________ Day Time Instructions: Answer all questions in the spaces provided. You have 90 minutes. You must show all work for full credit. There are 7 pages in this exam, and there is also a separate equation sheet. All temperatures are assumed to be 25°C unless otherwise stated. The following are not allowed at the exam: mp3 players, iPods and similar devices, headphones or earbuds, cell phones, iPads, Laptop computers, machines that go “Ping”. There are 6 questions; the points for each are indicated below. 1. _____________/20 2. _____________/14 3. _____________/12 4. _____________/20 5. _____________/20 6. _____________/14 Total _____________/100
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of 7 Page 2 of 7 1) (20 points) In the Ostwald process for oxidizing ammonia, a variety of products is possible - N 2 , N 2 O, NO, and NO 2 - depending on the conditions. One possibility is NH 3 (g) + 5 /4 O 2 (g) NO(g) + 3 /2 H 2 O(g) . . . . . K p = 2.11x10 19 at 700K. For the decomposition of NO 2 at 700K, NO 2 (g) NO(g) + 1 O 2 (g) . . . . . . . K p = 0.524 (a) Write a chemical equation for the oxidation of NH 3 (g) to NO 2 (g).
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Chem2080 2010 Prelim2 - Page 1 of 7 Chemistry 2080 - Spring...

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