Exam 3 2007 - Name _ Chemistry 112 Exam 3 April 11, 2007...

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Name _________________________ Chemistry 112 Exam 3 April 11, 2007 Question Points Possible Points Earned 11 0 21 6 31 1 42 5 52 0 61 8 Total 100 Useful information. .. F = 96500 C/mol ln K K H RT T 2 2 =− Δ E RT nF K n K cell eq eq 0 0 025693 == ln . ln EE n Q cell cell 0 00592 . log Δ Gn F E cell 00
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1. a. For each of the following reactions, tell whether /\ S is negative, positive, or there is not enough information to tell. Make sure to start with balanced reactions!! (10 points) a. Co +2 (aq) + K 3 PO 4 (aq) -> K + (aq) + Co 3 (PO 4 ) 2 (s) b. Na 2 S (s) -> 2 Na + (aq) + S -2 (aq) c. C 6 H 12 O 6 (s) + O 2 (g) -> CO 2 (g) + H 2 O (g) d. PCl 3 (g) + Cl 2 (g) -> PCl 5 (g) e.Br 2 (l) -> Br 2 (s)
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Pt Pt Ce ,Ce +3 +4 Co ,Co +3 +2 KCl 2. (16 points) a. Write the cell diagram for the electrochemical cell pictured. b. Write a balanced redox reaction describing the overall electrochemical reaction. c. If E o Ce+3/Ce+4 = 1.44 V and E o Co+2/Co+3 = 1.808 V and the concentrations of all species is 1 M, what is E o cell ? d. What is E cell if [Ce +3 ] = 0.15 M, [Ce +4 ] = 0.25 M, [Co +3 ] = 0.055 M, and [Co +3 ] = 0.020 M?
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3.
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Exam 3 2007 - Name _ Chemistry 112 Exam 3 April 11, 2007...

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