Question

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.

Answer 1

`\DeltaG=158235.4 J`

Step-by-step explanation:

The free-energy equation for a redox reaction is:

`\DeltaG=-n*F*E`

Where:

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

In this case:

`n=2 mol`

`F=96485 C/mol`

`E=0.82 V`

So:

`\DeltaG=-2mol*96485 C/mol*0.82 V`

`\DeltaG=158235.4 J`