$\Delta G^o = [(5 × -394.4) + 6(-237.2)] - [(-8.2) + 8 × 0] $ $= -3387$ કિ જૂલ $= -3387 × 10^{3} $ જૂલ
$(i)$ $C_5H_{12} + 10H_{2}O (l)\to 5CO_{2(g)} + 32\,H^{+} + 32\,e^{-}$ ( ઑક્સિડેશન )
$(ii)$ $8O_{2(g)} + 32H^{+} + 32e^{-} \to 16H_2O_{(l)} + 32H^{+} + 32e^{-}$ (રિડકશન )
$n = 32$ $\therefore \,\Delta {G^o} = - nF{E^o}_{cell} $ $\therefore \, - 3387 \times {10^3} =$ $- 32 \times 96500 \times {E^o}_{cell}$
$\therefore \,\,{E^o}_{cell} = \frac{{3387 \times {{10}^3}}}{{32 \times 96500}}\,\, = \,1.0968\,V$
$\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O}, \mathrm{E}^{\circ}=1.33 \mathrm{~V}$
$\mathrm{Fe}^{3+}(\mathrm{aq})+3 \mathrm{e}^{-} \rightarrow \mathrm{Fe} \mathrm{E}^{\circ}=-0.04 \mathrm{~V}$
$\mathrm{Ni}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Ni} \mathrm{E}^{\circ}=-0.25 \mathrm{~V}$
$\mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightarrow \mathrm{Ag} \mathrm{E}^{\circ}=0.80 \mathrm{~V}$
$\mathrm{Au}^{3+}(\mathrm{aq})+3 \mathrm{e}^{-} \rightarrow \mathrm{Au} \mathrm{E}^{\circ}=1.40 \mathrm{~V}$
આપેલી ઇલેક્ટ્રોકેમિસ્ટ્રી પ્રતિક્રિયાઓને લઈને, જે ધાતુ(ઓ) આકસ્મિક થશે તેનું ક્રોમિયમ ઓક્સાઇડ અમળમાં $\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}$ ના મૂળ્ય છે. . . . . .
વિદ્યુતવિભાજય $X$ શું છે?
