MT2-Sp11-v4-KEY - Name_ GSI _ Chemistry 4B, Spring 2011...

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Name__________________ GSI ____________________ Page 1 of 8 Chemistry 4B, Spring 2011 March 7, 2011 (50 min., closed book) Name: KEY G S I : S I D : S e c t i o n : Write your name and that of your GSI on all 8 pages of the exam. Equations, constants, and data are provided on the second page of the exam. 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-GC 3-4 20 2-HPLC 5-6 18 3-Fuel Cell 7 20 4-Redox Titration 8 22 Total 80 “What is the atomic weight of Bolognium?” http://technologyinclass.com/ 42 Bo ???
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Name__________________ GSI ____________________ Page 2 of 8 Useful Equations and Data Tables G = -RT ln K A X ሾXሿ F A S ሾܵሿ 101.3 J = 1 L atm R = 8.314 J / (mol K) X X X C A ] [ 305 / ( 1 51 . 0 log 2 z anode cathode cell E E E G  nFE cell Q nF RT E E ln Q n E E log 05916 . 0 (at 298K) K E RT nF ln F = 96,485C/mol e- N A = 6.022 10 23 1 cal = 4.18 J 1 amp = 1 C/sec 1 Watt = 1 J/sec i p (2.69 10 5 ) n 3 2 AD 1 2 c 1 2
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Name__________________ GSI ____________________ Page 3 of 8 1) Gas Chromatography (20 points) Fatty acids are of increasing concern for health reasons. Some fatty acids are essential to our diet while some contribute to heart disease. Methyl esters of fatty acids were separated by GC on a carbowax column. 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0123456789 1 0 1 1 1 2 Detectorsignal Time (min) Experiment 1, FAMEs on Carbowax 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0 5 10 15 20 25 30 Time (min) Experiment 2, FAMEs on Carbowax t m t m 1 2 3 4 5 1 2 3 4 5
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Name__________________ GSI ____________________ Page 4 of 8 Gas Chromatography (20 points) The first peak in both chromatograms is t m , the unretained solute. a) Calculate the resolution between peaks 3 and 4 for both experiments. (answers will vary) t r width t r width Exp1 Peak 3 8.8 0.6 Exp2 Peak 3 24.0 1.0 Exp1 Peak 4 9.3 0.75 Exp2 Peak 4 25.2 1.1 Res = t r /w av Exp1, = (9.3-8.8)/(0.9+0.75/2) = 0.7 Experiment 1 _ 0.7 Exp2, = (25.2-24.0)/(1.1+1.0/2) = 1.1 Experiment 2 _ 1.1 b) Calculate the number of theoretical plates for both experiments.
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This note was uploaded on 03/16/2012 for the course MATH 1B taught by Professor Reshetiken during the Spring '08 term at University of California, Berkeley.

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MT2-Sp11-v4-KEY - Name_ GSI _ Chemistry 4B, Spring 2011...

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