The standard free energy change for a reaction can be calculated using the equat

Question

The standard free energy change for a reaction can be calculated using the equation where n is the number of electrons transferred nFAE Fis Faradays constant, 96.5 kJ mol 1. v 1 AE0 is the difference in reduction potential For each of the following reactions, determine the number of electrons transferred (n) and calculate standard free energy (AG) a) half reactions: fumarate 2H succinate CoQH CoQ 2H overall reaction: fumarate CoQH succinate CoQ AE" 0.009 v Number Number k J mol b) half-reactions cytochrome c He ey to chrome c, Fe continued below

Explanation / Answer

a) no of electrons transferred n = 2

Given that Eo' = - 0.009 V

We know that

Go' = - nFEo' F = 96.5 kJ/mol/V

= - 2 x 96.5 kJ/mol/V x - 0.009 V

= +1.737 kJ/mol

Therefore,

Go' = +1.737 kJ/mol

b)

no of electrons transferred n = 1

Given that Eo' = 0.034 V

We know that

Go' = - nFEo'   F = 96.5 kJ/mol/V

= - 1 x 96.5 kJ/mol/V x 0.034 V

= - 3.28 kJ/mol

Therefore,

Go' =  - 3.28 kJ/mol

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