For a Ag-Zn button cell, the net reaction is `Zn (s)+Ag_(2)O(s)rarrZnO(s)+2Ag(s)` `DeltaG_(f)^(@)(Ag_(2)O)=-11.21kJ "mol"^(-1)` and `DeltaG_(f)^(@)(Zn

Question

For a Ag-Zn button cell, the net reaction is `Zn (s)+Ag_(2)O(s)rarrZnO(s)+2Ag(s)` `DeltaG_(f)^(@)(Ag_(2)O)=-11.21kJ "mol"^(-1)` and `DeltaG_(f)^(@)(Zn

For a Ag-Zn button cell, the net reaction is
`Zn (s)+Ag_(2)O(s)rarrZnO(s)+2Ag(s)`
`DeltaG_(f)^(@)(Ag_(2)O)=-11.21kJ "mol"^(-1)` and
`DeltaG_(f)^(@)(ZnO)=-318.3kJ "mol"^(-1)`
The `E_("cell")^ (@)` of this button cell is
A. 1.71V
B. 1.591V
C. 3.182V
D. 3.07V

Monjur Alahi

6 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - b
`DeltaG_("reaction")^(@)=DeltaG_(f)^(@)(ZnO)-DeltaG^(@)(Ag_(2)O)`
`=-3.18.3+11.21`
`=-30.09xx10^(2)J`
`DeltaG^(@)= -nE^(@)F`
`therefore E^(@)=(-DeltaG^(@))/(nF)`
Here n=2
`therefore E^(@)=(+3.07.09xx10^(3))/(2xx96500)=1.591V`

6 views Answered 2023-02-05 15:29