30THE NERNST EQUATIONThe cell potential allows one to determine the maximal work,−wmaxthe cell can produce. That is, the amount of work tomovenmoles of electrons though a potentialεcell.−wmax=nFεcell(30.1)whereF= 96485C/mol is Faraday’s constant.Once we know the maximal work for the cell, we can determinethe free energy of the cell by4rxnG=w0max=−nFεcell(30.2)As also have the4Gequation,4rxnG=4rxnGª+RTlnQ,(30.3)whereQ=[products][reactants]is the reaction quotient (remember we arenot at equilibrium)We can substitute4rxnG=−nFεcelland4rxnG°=−nFε°cellinto the above equation to give theNernst equation
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This document was uploaded on 11/01/2011 for the course CHM 2046 at University of Florida.