$2AgCl(s) + H_2(g) \rightarrow 2Ag(s) + 2H^{+} + 2Cl^{-}$ એ $G^o$ કેટલો થશે?
\(2AgC{l_{(s)\,}} + \,\,{H_{2(g)}}\, \to \,2A{g_{(s)}}\, + \,\,2{H^ + }\, + \,\,2C{l^ - }\)
\(\Delta {G^ \circ }\, = \,\,2\,\, \times \,\, - 21.52\,Kj\,\,\,\, = \,\, - \,\,43.04\,\,KJ\,\)
$Zn_{(s)} + Ag_2O_{(s)} + H_2O_{(l)} \rightleftharpoons $$2Ag_{(s)} + Zn^{2+}_{(aq)}+ 2OH^-_{(aq)}$
જો અર્ધકોષ પોટેન્શિયલ
$Zn^{2+}_{(aq)} + 2e^- \rightarrow Zn_{(s)}\,;\,\, E^o = - 0.76\, V$
$Ag_2O_{(s)} + H_2O_{(l)} + 2e^- \rightarrow 2Ag_{(s)} + 2OH^-_{(aq)}\,,$$E^o = 0.34\, V$
હોય, તો કોષ-પોટેન્શિયલ ......... $V$ થશે.