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प्रश्न
In the button cells widely used in watches and other devices, the following reaction takes place:
\[\ce{Zn_{(s)} + Ag2O_{(s)} + H2O_{(l)} -> Zn{^{2+}_{(aq)}} + 2Ag_{(s)} + 2OH^-_{ (aq)}}\]
Determine ΔrG° and E° for the reaction.
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उत्तर
\[\ce{E{^{\circ}_{{cell}}} = E{^{\circ}_{Ag_2O/Ag}} - E{^{\circ}_{{Zn^{2+}/Zn}}}}\]
= 0.344 − (−0.76)
= 1.104 V
For the cell reaction, n = 2
∴ \[\ce{\Delta_{r}G^{\circ} = -nFE{^{\circ}_{cell}}}\]
= –2 × 96500 × 1.104
= –2.13 × 105 CV mol–1
= –2.13 × 105 J mol–1
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