General Chemistry
General Chemistry
4th Edition
ISBN: 9781891389603
Author: Donald A. McQuarrie, Peter A. Rock, Ethan B. Gallogly
Publisher: University Science Books
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Chapter 25, Problem 25.57P
Interpretation Introduction

Interpretation:

The value of Ecello, ΔGrxno, Ecell and ΔGrxn has to be calculated for the electrochemical cell Zn(s)|Zn2+(aq, 0.010 M)||Cd2+(aq,0.050 M)|)|Cd(s).

Concept Introduction:

Standard potential (Ecello) can be calculated by the following formula,

  Ecello= Eredo+Eoxo

The relation between the standard cell voltage (Ecello) and standard free energy (ΔGrxno) is as follows,

  ΔGrxno =νeFEcello

Here, νe is the number of moles of electrons transferred in the two half reaction equations that gives the net reaction equation.

Nernst equation that shows the relationship between cell potential and reaction quotient is given by,

  Ecell=Ecell0(RTνeF)lnQ

Here, R is the gas constant.

T is Temperature

Q is Reaction Quotient

νe is number of electrons involved in cell reaction.

The relation between the standard cell voltage Ecell and ΔGrxn standard free energy is as follows.

  ΔGrxn =νeFEcell

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