${{\text{E}}^o }{\text{C}}{{\text{u}}^{{\text{2}} + }}{\text{/Cu = + 0}}{\text{.34 V, E}}_{{\text{F}}{{\text{e}}^{ + {\text{2}}}}/Fe}^o = \,\,{\text{ - 0}}{\text{.44 V}}$
$Fe\,(s)\,\, \to \,\,F{e^{2 + }}(aq)\,\, + \,\,2{e^ - }$ ....... એનોડ પર
$C{u^{2 + }}(aq)\, + \,\,2{e^ - }\, \to \,\,Cu\,\,(s)$ ........ કેથોડ પર
આપણે જાણીએ છીએ :
$\Delta \,{G^o } = \,- \,n\,F\,E_{cell}^o$ ; $n= 2$
$E_{cell}^o = \,\left[ {E_{(C{u^{2 + }}/cu)}^o - E_{(F{e^{2 + }}/Fe)}^o} \right]$
$ = ( + \,0.34\,V\,)\,- \,( - 0.44\,V)= +0.78\,V$ અને
$F= 96500\,C$
$\therefore \,\Delta \,{G^o } = \,- \,n\,\,F\,E_{cell}^o \,= \, - (2)\,\, \times \,(96500\,C)\,\, \times \,( + \,0\,.78\,V)$
$ = \,- 150540\,\,CV\, = \, - \,150540\,J$
$\,(\;\because \,1\,CV\, = \,1\,J)$
$C{u_{(s)}} + 2A{g^ + }_{(aq)} \to C{u^{2 + }}_{(aq)} + 2A{g_{(s)}}$
$F{{e}^{2+}}+2e\to Fe\,(s),$ ${{E}^{o}}\,=\,-\,0.44\,V$
સમગ્ર પ્રક્રિયા માટે $\Delta G$ નું મૂલ્ય કેટલા ........... $\mathrm{kJ}$ થાય?