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Mid-termSu08BK

# Mid-termSu08BK - Thermodynamics Electrochemistry Kinetics...

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Thermodynamics, Electrochemistry, Kinetics and Organic Structures Chem. 14B Dr. Beatriz E. Ruiz Silva UCLA Summer 2008 Mid-Term B Student _______KEY_______________________ Before handing in your quiz, read and sign the following: On my honor, I have neither given nor received any aid in this test. Signature _____________________________ Discussion session circle one 142043130 DIS1A Rachael Harper 142043230 DIS1B Rachael Harper 142043330 DIS1C Selma Duhovic 142043430 DIS1D Selma Duhovic The value of each question is indicated in parenthesis. Page 2 3 4 5 6 7 max Obt 15 16 16 17 18 18 TOTAL /100 Write in ink and show work if you want the opportunity to have your test regarded No sharing of calculator, cellular phones or programmable calculators are allowed during the test. DO NOT TURN THIS PAGE UNTIL YOU ARE ADVISED TO DO SO

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2 1. State the laws of thermodynamics: (6 points) a) The first law : Conceptual b) The second law; Conceptual c) The third law Conceptual 2. The reaction 4 Al (s) + 3 O 2(g) -> 2Al 2 O 3(s) was investigated. It was found that 1.00 mol of Al produced 3378 kJ of heat in this reaction under constant-pressure conditions at 1000. 0 C. What is the change in internal energy for the combustion of 1.00 mol of Al at 1000. 0 C? (5 points) Δ U = Δ H – nRT = -3378 x 10 3 J – (- ¾ mol) (8.3145 J/molK) (1273K) = - 3370. J 3. Write the equation that corresponds to the standard enthalpy of formation of liquid ethanol, C 2 H 5 OH (l) (4 points) 2C (g) + 3 H 2(g) + ½ O 2(g) C 2 H 5 OH (l) 4. Find the standard reaction enthalpy for the formation of one mol of CH 3 OH (l) from CH 4(g) and O (2) (5 points)
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