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Suppose CoQ (also known as ubiquinone) is reduced to CoQH2 by one of the iron-sulfur proteins, Fe-S(Fe2+), with a standard reduction potential Eo'= - 0.270 V at 37.0 oC. (Assume all values tabulated for 25 oC are unchanged at 37.0 oC; answer all questions below using this temperature.) (a) Write the relevant half-reactions and from these derive the balanced redox equation for the above reaction. (b) Calculate ?Eo'. (c) Calculate ?G o'. (d) Calculate the equilibrium constant, K. (e) Which side of the reaction (reactants or products or neither) is favored structurally? (f) Calculate the pH of the system that will generate a cell potential, ?E, of + 0.157 V when the ratio [Fe-S(Fe2+)]/[Fe-S(Fe3+)] = 2.25, [CoQ] = 8.17 x 10-4M, and [CoQH2] = 7.59 x 10-3M.

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