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

Answer:

$\DeltaG=158235.4 J$

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:

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

$\DeltaG=158235.4 J$