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Problem Set 11 - Chem 208 Spring 2008 Problem Set 11...

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Unformatted text preview: Chem 208, Spring 2008 Problem Set 11 Suggested Additional Problems: Ch 13: 47, 53, 55, 61, 63, 65, 73 Name: Ch 20: 57, 59, 61,65, 67 ' Lab TA Name: - Lab Time/Room: 1. One of the few industrial-scale processes that produces organic compounds electrochemically is used by the Monsanto Company to produce 1,4-dicyanobutane, NC—(CH2)4~CN. The reduction half reaction is 2 CH2=CHCN + 2H‘“ + 2e" —> NC~{CH2)4*CN The NC4CH2)4—CN is then chemically reduced by hydrogen gas to HzN—(CH2)6—NH2, one of the two major ingredients used to synthesize nylon. What current must be used to produce 150. kg of NC~(CH2)4»CN per hour? Chem 208, Spring 2008 Problem Set 11 2. A galvanic cell is based on the following half-reactions: Ag+(aq) + e' —* Ag(s) E" = 0.80 volt Pb2*(aq) + 2 e‘ —> Pb(s) E° = -0.125 volt The silver compartment of this cell contains a silver electrode and excess AgZSO4(s), and the lead lead compartment contains a lead electrode and [Pb2+] = 1.8 M. Calculate K5,, for AgZSO4 given that Ecell = 0.83 volt for the cell described above. 3. What mass of salt (NaCl) would you have to add to 2.0 liters of boiling water to increase the boiling point of the water by 5°? You may assume that NaCl totally dissociates into Na+(aq) and Cl'(aq). Is it true that salt is added to boiling water to make the food being boiled cook faster, or do you suspect there is another reason? ...
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