Practice Exam 1 Key

Practice Exam 1 Key - Chem 105b Sample Exam 1 Name_...

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1 Chem 105b Sample Exam 1 Name________________________ INSTRUCTIONS: 1. You must show your work to receive credit. If you need more space, use the back of the page. 2. The test has a total of 8 pages with 9 questions. Please make sure you have all of the pages before you begin. 3. Manage your time! If you get stuck on a problem – make sure you have attempted the other problems before spending too much time on it. Good luck! Equations: PV=nRT R = 0.08206 L atm K -1 mol -1 = 8.314 J/(mol K) k = A e -Ea/RT ln [k 2 /k 1 ] = E a /R(1/T 1 – 1/T 2 ) ln[A] = -kt + ln[A] o [A] = -kt + [A] o 1/[A] = kt + 1/[A] o K p = K(RT) dn
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2 1. (12 pts) An experiment is carried out where the concentration of N 2 O 5 is monitored over time. Using the following chemical equation and the data below answer the following questions. 2 N 2 O 5 (g) 4 NO 2 (g) + O 2 (g) Time (s) [N 2 O 5 ] (M) 0 1.00 10 0.85 20 0.73 30 0.64 40 0.56 50 0.50 60 0.45 70 0.41 80 0.38 90 0.35 100 0.33 a) The rate of formation of O 2 is _______ times the rate of consumption of N 2 O 5 . b) The rate of formation of NO 2 is _______ times the rate of consumption of N 2 O 5. c)
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This note was uploaded on 07/21/2009 for the course CHEM 105B taught by Professor Bau during the Summer '08 term at USC.

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Practice Exam 1 Key - Chem 105b Sample Exam 1 Name_...

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