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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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