Question

what is relationship between gibbs free energy and EMF of cell?

Answer 1

ΔG = -nFE
where ΔG = change in gibbs free energy
           n = no.of electrons
           E = emf of the cell

Answer 2

Answer: $\Delta G=-nFE$

Explanation:-

For any standard cell reaction associated with the passage of n electrons and an emf of E, the change in Gibbs energy is

$\Delta G=-nFE$

The $\Delta G$ is the change in Gibbs energy when the reaction occurs with the concentrations having the values employed in the cell.

A positive E means the reaction is operating spontaneously with the reactions occurring in the forward direction and this requires $\Delta G$ to be negative.