Gibbs Free Energy
The relationship between Gibbs free energy change and cell potential is:
Select the correct option:
Solution
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.
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More gibbs free energy Practice Questions
The standard Gibbs free energy change (ΔG°) for a reaction at 298 K is −5.70 kJ mol⁻¹. The equilibri...
The standard Gibbs free energy change (ΔG°) for a reaction at 298 K is −5.70 kJ mol⁻¹. The equilibri...
At 298 K, a reaction has ΔH = +25 kJ mol⁻¹ and ΔS = +120 J mol⁻¹ K⁻¹. Is the reaction spontaneous at...
At 298 K, a reaction has ΔH = +25 kJ mol⁻¹ and ΔS = +120 J mol⁻¹ K⁻¹. Is the reaction spontaneous at...
For a reaction to be spontaneous at all temperatures, which condition must be satisfied?
For a reaction to be spontaneous at all temperatures, which condition must be satisfied?
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.
Looking for more practice? Explore all chemistry questions or browse redox reactions and electrochemistry questions on RankGuru.