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The zinc / siver oxide cell is used in e...

The zinc / siver oxide cell is used in electric watches
`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

A

`2.13 xx10^(2)`

B

`-213072`

C

`+213072`

D

`213.072`

Text Solution

Verified by Experts

The correct Answer is:
D
`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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