Chem MT3 2007

Chem MT3 2007 - Name_GSI_ Chemistry 1A, Fall 2007 Midterm...

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Name_____________GSI______________ Page 1 of 7 Chemistry 1A, Fall 2007 Midterm Exam III November 13, 2007 (90 min, closed book) N a m e : T A : S I D : S e c t i o n : Please read this first: Write your name and that of your TA on all 8 pages of the exam Test-taking Strategy In order to maximize your score on the exam: Do the questions you know how to do first. Go back and spend more time on the questions you find more challenging. Budget your time carefully -- don't spend too much time on one problem. Show all work for which you want credit and don't forget to include units. Question Page Points Score 1 3 18 2 4 10 3abcd 5 12 3efghi 6 18 4 7 14 5 8 8 Total 80 Useful Equations and constants: G ° = H ° - T S ° H ° = Σ n H ° f (products) - Σ n H ° f (reactants) S ° = Σ nS ° (products) - Σ nS ° (reactants) G ° = Σ n G ° f (products) - Σ n G ° f (reactants) S = k B lnW S = q rev /T E = q + w w = - P ext V G ° = - RTln K G = G ° + RTln Q G ° = - nF Є º Є = Є º - (RT/nF) lnQ R S T R H K ° + ° = 1 ln N 0 = 6.02214 x 10 23 mol -1 T (K) = T (C) + 273.15 F = 96,485 C / mol 1 V = 1 J / C R = 8.31451 J K -1 mol -1 R = 8.20578 x 10 -2 L atm K -1 mol
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Name_____________GSI______________ Page 2 of 7 1) Evaluating H°, S°, and G°. Consider some reactions you have seen in demonstrations in lecture. The change in free energy under standard conditions is given. a. Place checks in the boxes if the reactions match the statements at the top of the columns. Reaction rxn (kJ) at 25°C Products favored Definitely positive Definitely exothermic I. N 2 O 4 (g) ' 2NO 2 (g) (smog) +4.73 II. C 12 H 22 O 11 (s) 12C (s) + 11H 2 O (l) (dehydration of sucrose, black snake) -1062 III. I 2 (s) ' I 2 (g) +19.33 b. Determine the equilibrium constant K c at 25°C for Reaction I. Show your work. K = ___________________
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This note was uploaded on 08/10/2010 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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Chem MT3 2007 - Name_GSI_ Chemistry 1A, Fall 2007 Midterm...

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