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In the button cells widely used in watch...

In the button cells widely used in watches and other devices the following reaction takes place :
`Zn(s)+Ag_(2)O(s)+H_(2)O(l) rarr Zn^(2+)(aq)+2Ag(s)+2OH^(-)(aq)`
Determine `Delta_(r)G^@` and `E^(@)` for the reaction.

Text Solution

Verified by Experts

Zn is oxidzed and `Ag_(2)O` is reduced.
`E_(cell)=E_(Ag_(2)O,Ag("reduction"))^(@)-E_(Zn//Zn^(2+)("oxidation"))^(@)`
`=0.344+0.76=1.104V`
`DeltaG=-nFE_(cell)=-2xx96500xx1.104J`
`=2.13xx10^(5)J`
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