What is the relation between electrochemical cell and Gibbs free energy of the cell reaction?

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Solution

The change in Gibbs free energy for an electrochemical cell can be related to the cell potential. Relation between Electrochemical Cell Potential and Gibbs free Energy change is given by; Δ G = -nFE where Delta G is Gibbs Free energy change , n is the number of electrons involved in the reaction and F is Faraday and E is the Cell potential.

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Q. The cell potential

(E)

and the free energy change

(△ G)

accompanying an electrochemical reaction are related by:

The standard reaction Gibbs energy for the electrochemical reaction,

$C r_{2} O_{7}^{2 -} + 2 F e + 14 H^{+} \to 2 C r^{3 +} + 2 F e^{3 +} + 2 H_{2} O$ , is $- 793 k J m o l^{- 1}$ . The standard cell potential is Volts.

Gibbs free energy change for a cell reaction is positive what does it indicates?

The standard reaction gibbs energy for the electrochemical reaction.

$C r_{2} O_{7}^{2 -} + 2 F e + 14 H^{+} \to 2 C r^{3 +} + 2 F e^{3 +} + 2 H_{2} O$ is $- 793 k J m o l^{- 1}$ . The standard cell potential is:

Q. The standard reaction, Gibbs energy for the electrochemical reaction.

C r_{2} O_{7}^{2 -} + 6 F e^{2 +} + 14 H^{+} \to 2 C r^{3 +} + 6 F e^{3 +} + 7 H_{2} O i s - 793 k J m o l^{- 1}

The standard cell potential is:

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