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    Calculating enthalpy change in an oxidation ratio

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    What is deltaE for the oxidation of ubiquinol by cytochrome c when the ratio of [QH2]/[Q] is 10 and the ratio of [cyt c3+]/[cyt c2+] is 5?

    cytochrome c (Fe3+) + e- <---------> cytochrome c (Fe2+) E'o = 0.254V

    Ubiquinone + 2H+ + 2e- <-----------> ubiquinol + H2 E'o = 0.045V

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    Solution Preview

    What is ΔE for the oxidation of ubiquinol by cytochrome c when the ratio of [QH2]/[Q] is 10 and the ratio of [cyt c3+]/[cyt c2+] is 5?

    cytochrome c (Fe3+) + e- <---------> cytochrome c (Fe2+) E'˚ = 0.254V

    Ubiquinone + 2H+ + 2e- <-----------> ubiquinol + H2 E'˚ = 0.045V

    The electrode potential, because of its measure of the chemical driving of the half reaction, is affected by concentration. Thus the tendency of the cytochrome c to oxidize ubiquinol is driven by the concentrations of the ...

    Solution Summary

    This solution is provided in 356 words in an attached .doc file. It discusses Nernst equations and how this relates to the problem, as well as explains step-by-step how to find the change in enthalpy.

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