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How is Gibbs energy (G) related to the c...

How is Gibbs energy (G) related to the cell emf (E) mathematically ?

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Gibbs energy is related to emf of a galvanic cell by the following equation .
` Delta G = - n F E `
Where ` Delta G ` = change in Gibbs energy
n = No. of electrons involved
F = Faraday = 96500 C ` mol^(-1)`
E = emf of galvanic cell
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