Electron Equivalent is a concept commonly used in redox chemistry, reactions involving electron transfer

Electron transfer

Electron transfer is the process by which an electron moves from an atom or a chemical species to another atom or chemical species...

, to define a quantity (e.g. energy or moles) relative to one electron. Energies of formation

Gibbs free energy

In thermodynamics, the Gibbs free energy is a thermodynamic potential that measures the "useful" or process-initiating work obtainable from a thermodynamic system at a constant temperature and pressure...

are often given as kilojoules per electron equivalent to enable calculation of specific reaction energies on a "per electron" basis. Reactions containing movement of electrons are often balanced such that reaction quantities are given in relation to the transfer of a single electron, allowing quantification of reactants and products in relation to a single electron transfer.