An iron–sulfur protein in Complex III donates an electron to cytochrome c1. The reduction half-reactions and Ɛ°' values are shown below. Calculate the standard free energy change. Use 2 significant figures. FeS (ox) + e– → FeS (red) Ɛ°' = 0.280 V cyt c1 (Fe3+) + e– → cyt c1 (Fe2+)

Chemistry by OpenStax (2015-05-04)
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Chapter19: Transition Metals And Coordination Chemistry
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Problem 15E: The standard reduction potential for the reaction [Co( H 2 O)6]3+(aq)+e[CO( H 2 O)6]2+(aq) is about...
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An iron–sulfur protein in Complex III donates an electron to cytochrome c1. The reduction half-reactions and Ɛ°' values are shown below. Calculate the standard free energy change. Use 2 significant figures.

FeS (ox) + e– → FeS (red) Ɛ°' = 0.280 V
cyt c1 (Fe3+) + e– → cyt c1 (Fe2+) Ɛ°' = 0.215V
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