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Web_Quiz_6_Key - Web Quiz 6 with answer

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1 Worked Solutions for Web Quiz #6 1. The standard free energies of formation of several aqueous species are: H + ( aq ) 0 kJ/mol H 2 O( l ) -237 kJ/mol CH 3 OH( aq ) -163 kJ/mol HCOOH( aq ) -351 kJ/mol e - 0 kJ/mol What is the standard reduction potential of methanoic acid in aqueous solution (i.e., for HCOOH + 4H + + 4e - CH 3 OH + H 2 O)? (2 sig figs) 2. A common car battery consists of six identical cells each of which carries out the reaction Pb + PbO 2 + 2HSO 4 - + 2H + 2PbSO 4 + 2H 2 O Suppose that in starting a car on a cold morning a current of 125 amperes is drawn for 15.0 seconds from a cell of the type described above. How many grams of Pb would be consumed? (The atomic weight of Pb is 207.19.) A. 8.05 B. 2.01 C. 0.018 D. 0.036 E. 4.02
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