Question

Calculate the standard cell potential at 25 ∘C for the reaction
X(s)+2Y+(aq)→X2+(aq)+2Y(s)
where ΔH∘ = -703kJ and ΔS∘ = -245J/K .

Answer 1

Combine: \(\Delta G=\Delta H-T\Delta S\) and \(\Delta G=-n\xi F\)

\(\Delta H-T\Delta S=-n\xi^o F\)

\(\xi ^o=\dfrac{-(\Delta H-T\Delta S)}{nF}=\dfrac{T\Delta S-\Delta H}{nF}\)

\(\xi ^o\) =Standard potential
\(F\)=faradays constant
n=stoichiometry of electrons transferred (equal to 2 here)