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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 plance :
`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

In the given cell, Zn is oxidised to `Zn^(2+)` and `Ag_(2)O` is reduced to Ag.
`therefore E_("cell")^(@)=E_("cathode")^(@)-E_("anode")^(0)=[0.344-(-0.76)V]=1.104 V`
`therefore Delta_(r )G^(@)=-nFE_("cell")^(@)=-2xx96500xx1.104=-2.13xx10^(5)J`
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In the button cell, wiedly used in watches, the following reaction takes palce: Zn(s)+Ag_(2)O(s)+H_(2)O(l)rarr Zn^(2+)(aq)+2Ag(s)+2OH^(-)(aq) Determine E^(@) and DeltaG^(@) for the reaction. ["Given : "E_(Ag^(+)|Ag)^(@)=+080V, E_(Zn^(2+)|Zn)^(@)=-0.76V]

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