Electrochemistry - Result Question 39
####41. For the reduction of silver ions with copper metal, the standard cell potential was found to be $+0.46 V$ at $25^{\circ} C$. The value of standard Gibbs energy, $\Delta G^{0}$ will be $(F=96500 C mol^{-1})$
(a) $-89.0 kJ$
(b) $-89.0 J$
(c) $-44.5 kJ$
(d) $-98.0 kJ$
[2010]
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Solution:
(a) $Cu+2 Ag _{(\text{aq })}^{+} \longrightarrow Cu _{(\text{aq) }}^{2+}+2 Ag _{(\text{s })}$
Here, $n=2$,
$ E _{\text{cell }}^{0}=+0.46 V $
$\Delta G^{o}=-n E^{\circ} F=\frac{-2 \times 0.46 \times 96500}{1000} kJ \simeq-89 kJ$
