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The relation between a cell's EMF and the free energy change of its reaction is

  • A.\( \Delta G = -E/nF \)
  • B.\( \Delta G = -nF/E \)
  • C.\( \Delta G = -nFE \)
  • D.\( \Delta G = nFE \)

Answer: C

A positive EMF therefore corresponds to a negative free energy change and a spontaneous reaction. The maximum electrical work obtainable equals the free energy decrease, which is why a cell is measured at zero current.

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