Gibbs Free Energy
The relationship between Gibbs free energy change and cell potential is:
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About This Question
- Subject
- chemistry
- Chapter
- redox reactions and electrochemistry
- Topic
- gibbs free energy
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
ΔG = -nFE
The electrical work performed by a galvanic cell is equal to the decrease in Gibbs Free Energy.
- Formula: ΔG=−nFEcell
- Where:
- n: number of moles of electrons transferred in the balanced equation.
- F: Faraday constant (approx. 96,500 C/mol).
- Ecell: the electromotive force (EMF) of the cell.
- A spontaneous reaction in a cell requires a positive Ecell and therefore yields a negative ΔG.
This easy difficulty chemistry question is from the chapter redox reactions and electrochemistry, covering the topic of gibbs free energy. It appeared in the 2025 exam.
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