Mid-termSu07K - Thermodynamics, Electrochemistry, Kinetics...

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Thermodynamics, Electrochemistry, Kinetics and Organic Structures Chem. 14B Dr. Beatriz E. Ruiz Silva UCLA Summer 2007 Mid-Term Student ______________________________ Before handing in your quiz, read and sign the following: On my honor, I have neither given nor received any aid in this quiz. Signature _____________________________ Discussion session circle one 142043130 DIS1A Stephanie Wolahan 142043230 DIS1B Stephanie Wolahan 142043330 DIS1C Chris Tassone 142043430 DIS1D Chris Tassone Page 2 3 4 5 6 7 max Obt 15 16 16 17 18 18 TOTAL /100 This test consists of 7 pages including this one. Periodic and data tables are provided separately. Questions # 1,2,3,5,6,8,9,15 are worth 5 points each. The reminder of the questions are 6 points each. If you believe there is an error in the grading of your test; write an explanation, attach it to the quiz and hand in both to the instructor within one week. Write in ink and show work if you want the opportunity to have your test regarded. DO NOT TURN THIS PAGE UNTIL YOU ARE ADVISED TO DO SO
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2 1. Define the following thermodynamic systems and give one example of each. Isolated system CAN NOT EXCHANGE MATTER NOR ENERGY WITH THE SURROUNDINGS Examples vary Closed system CAN EXCHANGE ENERGY BUT NOT MATTER WITH THE SURROUNDINGS Examples vary 2. A sample of benzene, C 6 H 6 , was vaporized at 25 0 C. When 37.5 kJ of heat was supplied, 95 g of liquid benzene vaporized. What is the enthalpy of vaporization of benzene at 25 0 C? Because phase transitions typically take place at constant pressure, the heat transfer gives the change in enthalpy of the substance n = (95 g) (mol/ 78.11g) = mol Δ H vap = 37.5 kJ / mol = 31 kJ/mol 3. In the manufacture of nitric acid by the oxidation of ammonia the first product is nitric oxide, which is then oxidized to nitrogen dioxide. From the standard reaction enthalpies A) N 2(g) + O 2 (g) 2 NO (g) Δ H 0 = +180.5 kJ B) N 2 (g) + 2 O 2 (g) 2 NO 2 (g) Δ H 0 = + 66.4 kJ Calculate the standard reaction enthalpy for the oxidation of nitric oxide to nitrogen dioxide 2 NO (g) + O 2(g) 2 NO 2(g) Reverse A and add to B Δ H
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This note was uploaded on 03/06/2012 for the course CHEM 14A 142042200 taught by Professor Lavelle during the Summer '10 term at UCLA.

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Mid-termSu07K - Thermodynamics, Electrochemistry, Kinetics...

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