11.15.11 discussion key - Discussion Section Questions...

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Discussion Section Questions 11.15.11 1) Nicotine adenine dinucleotide (NAD) is cellular redox reagent. The reduced form of NAD is abbreviated NADH and the oxidized for is NAD + . In the cell, oxygen O 2 is reduced by NADH according to : . Assume the two reduction potentials: a) Calculate the standard cell potential and standard free energy change for the reduction of oxygen by NADH: Solution: Note you do not adjust for stoichiometry because cell voltages are not intensive (not per mole quantities). b)Calculate the cell voltage E cell and ! G assuming [NADH]=0.035M, [NAD + ]=0.004M, pH=7, and P O2 =0.05 bars. Assume also all standard concentrations are 1M and the standard oxygen pressure is 1 bar. Is this reaction endergonic or exergonic under these conditions? Is work required or produced in order to oxidize NADH and reduce oxygen? Solution: The cell voltages is: So we have to calculate the reaction quotient: Therefore: Work is produced because ! G<0. The reaction is exergonic. c)For every mole of NADH oxidized, three moles of ATP are produced
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11.15.11 discussion key - Discussion Section Questions...

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