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Horvath Practice Problems 118

Horvath Practice Problems 118 - 30 THE NERNST EQUATION The...

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30 THE NERNST EQUATION The cell potential allows one to determine the maximal work, w max the cell can produce. That is, the amount of work to move n moles of electrons though a potential ε cell . w max = n F ε cell (30.1) where F = 96485 C/mol is Faraday’s constant. Once we know the maximal work for the cell, we can determine the free energy of the cell by 4 rxn G = w 0 max = n F ε cell (30.2) As also have the 4 G equation, 4 rxn G = 4 rxn G ª + RT ln Q, (30.3) where Q = [ products] [ reactants] is the reaction quotient (remember we are not at equilibrium) We can substitute 4 rxn G = n F ε cell and 4 rxn G ° = n F ε ° cell into the above equation to give the Nernst equation
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