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Chapter 8: Q 33P (page 221)

Question: Write a balanced equation for the oxidation of ubiquinol by cytochrome c. Calculate鈭�G掳垄 and鈭�E掳垄 for the reaction.

Short Answer

Expert verified

The balanced equation is:

2 Cyto c (Fe3+) + ubiquinol 鈫�2 cyroc ( Fe2+) + ubiquinone + 2H+

鈭�E掳=0.190V

鈭�G掳=-36.7kJmol-1

Step by step solution

01

Definition of oxidation

Oxidation is the process of a molecule, an atom, or an ion losing electrons.

02

Balanced equation for oxidation

Ubiquinol is oxidized by cytochrome c(Fe3+), since cytochrome c (Fe3+) has higher reduction potential. Oxidation of ubiquinol releases 2 electrons, while cytochrome c(Fe3+) can only take 1, so 2 cytochromes c (Fe3+) are needed.

Thus, the balanced equation is:

2 cyto c (Fe3+) + ubiquinol 鈫�2 cyto (Fe2+) + ubiquinone +2H+

03

Calculation of ΔG°’ and ΔE°’

鈭�G掳' is calculated from鈭�E掳change. All the data is obtained from the Table 14.4.

鈭�E=E掳Eelectronaceeptor)-E掳(electrondonor)=0.235V-0.045V=0.190VNow,鈭�G掳=-nF鈭�E掳

= -2脳96.485 kJV-1 mol-1脳0.190 V

= -36.7kJ mol-1

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