1.

The zinc / siver oxide cell is used in electricwatches Zn rarr Zn^(2+) + 2e^(-), E^(@)=0.76 V Ag_(2)+H_(2)O+2e^(-)rarr2ag+2OH^(-),E^(@)=-0.344 V what is triangle G^(@)in joules for the reaction

Answer»

`2.13 xx10^(2)`
`-213072`
`+213072`
`213.072`

Solution :`Zn(s)+2Ag^(+) (Aq) rarr Zbn^(2+)(Aq)+2 Ag(s)`
`E_("CELL")^(@)=E_("cathode")^(@)-E_("ANODE")`
`=E_(Zn^(2+)//Zn)^(@)-E_(Ag^(+)//Ag)^(@)`
`=-213072 CV=- 213072 J`


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