• The relationship between Gibbs free energy of the cell reaction in a galvanic cell and the emf of the cell:

Δ_rG_cell = -nFE_cell

Where, Δ_rG_cell= Gibbs free energy of the reaction.

F= Faraday constant

E_cell = Emf of the cell

n= Number of moles of electron transferred in the radox reaction.

• At standard condition,

When, concentration of all reacting species is unity, T= 298 K

E_cell=

Or, ΔG° = -nF

• The maximum work can be obtained from a galvanic cell when the charge is passed reversibly.

• The reversible work done by the galvanic cell is written as,

Δ_rG_cell = -nFE_cell