96485Jmol

96485Jmol is an energy unit equivalent to one mol of Faraday's constant expressed in joules per mole rather than coulombs per mole. The numeric value 96485 originates from the elementary charge (1.602176634×10^-19 C) multiplied by Avogadro's number (6.02214076×10^23 mol^-1). When the charge is applied to an electric potential of one volt, the work done is equal to the electrical energy expressed in joules; thus 96485 J/mol equals 96485 C/mol at a potential of 1 V. This conversion is frequently used in electrochemistry, particularly in the calculation of Gibbs free energy changes and cell potentials for reactions involving one mole of electrons.

The unit is linked to the Nernst equation, which relates cell potential to standard potential, temperature, and the ratio of product and reactant activities. By substituting 96485 J/mol for the Faraday constant and using the natural logarithm base, the Nernst equation is expressed as E = E° − (RT/F) ln Q, where F is Faraday's constant. Replacing F with 96485 J/mol and noting that R (8.314 J·mol^-1·K^-1) divides out yields the term (RT/96485) ln Q, which is convenient for thermodynamic calculations.

In practice, 96485Jmol is used when calculating the change in free energy (ΔG) for electrochemical processes: ΔG = −nFE where n is the number of moles of electrons, and F is the Faraday constant in J/mol. This form circumvents explicit reference to charge units and is common in textbooks that emphasize energy balances over electrochemical potentials.

The unit maintains dimensional homogeneity with other thermodynamic quantities. While not declared in any international code of chemical nomenclature, 96485 J/mol is often reported in scientific literature as a shorthand for the electrochemical energy equivalent per mole of electrons.