What is the standard cell potential of this photovoltaic cell? Answer is given b

Question

What is the standard cell potential of this photovoltaic cell?

Answer is given but would like to know equations/steps used.

1. The reaction of iron metal with aqueous copper(l) sulfate to from copper metal and iron(II) sulfate can be used in a voltaiccell. Write an ionicchemical equation for this reaction Fe(s) Cu2+(aq)-Cu(s) Fe2 (aq) Write an equation for the oxidation half-reaction. Fe(s) Fe2+ (aq) + 2e- Write an equation for the reduction half-reaction. Cu2+(aq)+ 2e- Cu(s) Draw a diagram ofa voltaic cell that employs these half-reactions. wire Cu 2 porous glass plate FeS2 (aq) CuS, (aq) Which half-reaction occurs at the anode, and which half-reaction occurs at the cathode? Oxidation at the anode and reduction at the cathode what isthe standard cell potential ofthiscell? E +0.78 V

Explanation / Answer

For the reaction

Fe+2 + 2e--à Fe     E0 =-0.44 V (1)

Reversing reaction (1)

Fe--à Fe+2 + 2e-   (1A) E0= 0.44V

For the reaction

Cu+2 + 2e- -à Cu   E0=0.34V (2)

The reaction required is

Fe (s) + Cu+2 ---- > Fe+2 + Cu(s)

This can be obtained by adding (1A) and (2)

Fe+ Cu+2--à Fe+2 + Cu   E0= 0.44+0.34= 0.78 V

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