ΔG° from E°

Worked example

A cell reaction transfers 4 electrons and has E° = 1.47 V. Calculate ΔG°.

1. 1. Gibbs energy and cell potential: solve for ΔG°

   $\Delta G^\circ = -nFE^\circ$

   = −567.3 kJ mol⁻¹

Answer: ΔG° = −567 kJ mol⁻¹

Method

ΔG° = −nFE°. A positive E° means a spontaneous cell (negative ΔG°).

Formulas used

• Gibbs energy and cell potential

  $\Delta G^\circ = -nFE^\circ$

More electrochemistry questions

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• Equilibrium constant from E°cell
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• Disproportionation constant from a Latimer diagram
• Daniell cell away from standard conditions