The $E^{o}$ values of the following reduction reactions are given:
$F e^{3+}(a q)+e^{-} \rightarrow F e^{2+}(a q), E^{o}=0.771\, V $
$F e^{2+}(a q)+2 e^{-} \rightarrow F e(s), E^{o}=-0.447\, V$
What will be the free energy change for the reaction?
$Fe ^{3+}( aq )+3 e^{-} \rightarrow Fe ( s )\left( F =96485\, C\, mol ^{-1}\right)$