14. Complex III in mitochondria catalyzes the oxidation of coenzyme Q, which is also called Ubiquinone (UQ in oxidized version, UQH; in reduced version), using an iron atom in cytochrome C: 2 Cyt-C-Fe³+ (aq) + UQH₂ (aq)-2 Cyt-C-Fe²+ (aq) + UQ (aq) + 2 H* (aq) a) The equilibrium constant when pH-7 is 1.4x10°. What is AG? b) What is AG for a system in which the Fe" :Fe" ratio is 2:1 and the UQH::UQ ratio is 1:100 at pH-9?

14. Complex III in mitochondria catalyzes the oxidation of coenzyme Q, which is also called Ubiquinone (UQ in oxidized version, UQH; in reduced version), using an iron atom in cytochrome C: 2 Cyt-C-Fe³+ (aq) + UQH₂ (aq)-2 Cyt-C-Fe²+ (aq) + UQ (aq) + 2 H* (aq) a) The equilibrium constant when pH-7 is 1.4x10°. What is AG? b) What is AG for a system in which the Fe" :Fe" ratio is 2:1 and the UQH::UQ ratio is 1:100 at pH-9?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

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Question

14. Complex III in mitochondria catalyzes the oxidation of coenzyme Q, which is also called Ubiquinone (UQ
in oxidized version, UQH: in reduced version), using an iron atom in cytochrome C:
2 Cyt-C-Fe³+ (aq) + UQH₂ (aq)-2 Cyt-C-Fe²+ (aq) +UQ (aq) + 2 H* (aq)
a) The equilibrium constant when pH-7 is 1.4x10°. What is AGEN?
b) What is AG for a system in which the Fe Fe" ratio is 2:1 and the UQH::UQ ratio is 1:100 at pH=9?

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Step 4: b. Determination of Gibbs energy change- Part 2. Calculation of reaction quotient.

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