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Calculate the standard free energy change as a pair of electrons is transferred from succinate to molecular oxygen in the mitochondrial respiratory chain. Oxidant Reductant n E∘′(V) Fumarate 2H 2e− ⇌ Succinate 2 0.03 12O₂ 2H 2e− ⇌ H2O 2 0.82 Express your answer to two significant figures and include the appropriate units.

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Giangiglia

Answer:

[tex]\DeltaG=158235.4 J[/tex]

Explanation:

The free-energy equation for a redox reaction is:

[tex]\DeltaG=-n*F*E[/tex]

Where:

  • n=is the number of electrons involved in the reaction
  • F= is the constant of Faraday
  • E=redox potential

In this case:

[tex]n=2 mol[/tex]

[tex]F=96485 C/mol[/tex]

[tex]E=0.82 V[/tex]

So:

[tex]\DeltaG=-2mol*96485 C/mol*0.82 V[/tex]

[tex]\DeltaG=158235.4 J[/tex]

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