The balanced equation gives the ratio of moles of electrons to moles of other species, and the number of moles of electrons can be converted into coulombs using the value of the faraday.
Charge is the product of current and time for direct current.
Stoichiometric oxidation or reduction reactions are reactions in which both atoms and charge must be balanced. Simple reductions or oxidations are easily balanced. However, in aqueous solutions these reactions may not be simple because the solvent water can become involved in the reaction. The number of electrons necessary to balance the charge is the charge number of the electrode reaction, z. Example. If the reaction takes place in a basic aqueous solution rather than an acidic one, protons will not be available.