Convert standard cell potential into standard reaction Gibbs energy.
Difficulty
Intermediate
Read time
3 min
Prerequisites
Algebra, logarithms, and molar quantities
Source
OpenStax, Chemistry 2e, §17.4Adapted from Teng-Jui Lin’s CHEM 155 equation sheet. The linked textbook reference was used to check the equation and its physical context. Pending editorial review.
Adapted from Teng-Jui Lin, Equation Sheets, under CC BY 4.0.
FormuLab adapted notation and chemical symbols, added variable meanings, units, applicability conditions, and an original worked example.
A positive standard cell potential corresponds to a negative standard Gibbs energy change for the redox reaction as written. The electron-transfer number links electrical charge to a mole of the balanced reaction.
| Symbol | Meaning | Units |
|---|---|---|
| Standard Gibbs energy change per mole of reaction | ||
| Number of electrons transferred per balanced reaction | ||
| Faraday constant: charge per mole of electrons | ||
| Standard reversible cell potential |
Estimate standard Gibbs energy from electrochemical data.
Connect a positive cell potential with a negative standard reaction Gibbs energy.
A balanced cell reaction transfers two electrons and has standard potential +1.10 V. Calculate its standard Gibbs energy change per mole of reaction.
Adapted from Teng-Jui Lin’s CHEM 155 equation sheet. The linked textbook reference was used to check the equation and its physical context. Pending editorial review.
Adapted from Teng-Jui Lin, Equation Sheets, under CC BY 4.0.
FormuLab adapted notation and chemical symbols, added variable meanings, units, applicability conditions, and an original worked example.
Assumptions
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