For the reaction
2Co3+(aq)+2Cl−(aq)→2Co2+(aq)+Cl2(g). E∘=0.71 V
what is the cell potential at 25 ∘C if the concentrations are [Co3+]= 0.137M , [Co2+]= 0.180M , and [Cl−]= 0.397M and the pressure of Cl2 is PCl2= 9.10atm ?

Question

For the reaction
2Co3+(aq)+2Cl−(aq)→2Co2+(aq)+Cl2(g).  E∘=0.71 V
what is the cell potential at 25 ∘C if the concentrations are [Co3+]= 0.137M , [Co2+]= 0.180M , and [Cl−]= 0.397M and the pressure of Cl2 is PCl2= 9.10atm ?

aaronq · Answer

You have to use the Nernst Equation:  $ξ=ξ^o-\dfrac{RT}{nF}ln(Q)$