If we know the standard state free energy change, G^o, for a chemical process we can calculate the cell potential, E^o, for an electrochemical cell based on that process using the relationship between G^o and E^o:

Rearrangement gives

In this equation

• n is the number of moles of electrons exchanged in the cell reaction.
• F is 96.485 kJ volt^-1 mol^-1 (the "Faraday").