1. INTRODUCTION The potential in an electrochemical cell, E, is related to the G

Question

1. INTRODUCTION The potential in an electrochemical cell, E, is related to the Gibb's free energy change (AG) for the overall cell redox reaction: (1) AG n FE where n is the number of electrons transferred during the redox reaction, F is Faraday's constant (96,500 C/mol), and the superscript 0 indicates standard conditions (1 atm, 1 M concentrations, and 25 °C). Thus, a measurement of the cell voltage at standard conditions can be used to determine AG As an example, the following cell reaction: Zn(m) Cuz (aq) Znz (aq) Cu(m) generates a cell voltage of +1.10 v under standard conditions. Calculate and enter below 4G (with 3 sig figs) for this reaction in kl/mol. kJ/mol

Explanation / Answer

Zn -----> Zn+2 + 2e-

Cu+2 +2e- -------> Cu

DG0= -2 x 96500 x1.10= 2.12 x 105 KJ/mol

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