chris quiz 1

chris quiz 1 - CHEM 6C Spring 2006 Name:...

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Unformatted text preview: CHEM 6C Spring 2006 Name: __________KEY___________ Section C08 TA: Chris Meier Quiz #1: Electrochemistry I April 12, 2006 You must show your work for all problems in order to receive credit. G= nFE= RT ln K F=9.6485 10 4 C mol-1 , R=8.314 J K-1 mol-1 , RT/F=0.0257 V at 25 C 1. (a) Balance the following reaction in basic solution. MnO 4- + H 2 SO 3 Mn 2+ + SO 4 2- E= +1.34 V (b) What is the free energy change of this reaction? Assume you use the least amount of reactant that still allows for the reaction to occur (the smallest whole number coefficients in your balanced reaction). Is it spontaneous as written or in the reverse direction? " G = -nFE = -(10)(9.6485 # 10 4 )(1.34) = -1.25 # 10 6 C $ V mol = -1.25 # 10 3 kJ mol spontaneous as written (+E or - " G) 2. Given the following redox couples: Cl 2 (g)/Cl- (aq) E = +1.36 Ti 3+ (aq)/ Ti 2+ (aq) E = 0.37 (a) Write the cell diagram for a galvanic cell constructed with the above listed redox couples in the two...
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