Home
Class 12
CHEMISTRY
A button cell used in watched funcations...

A button cell used in watched funcations as follwing
`Zn(s)+Ag_(2)O(s)+H_(2)O(l)hArr2Ag(s)+Zn^(2+)(aq.)+2OH^(-)(aq)`
If half cell potentials are
`Zn^(2+)(aq.)+2e^(-) rarr Zn(s), E^(@) = -0.76 V`
`Ag_(2)O(s)+H_(2)O(l)+2e^(-) rarr 2Ag(s)+2OH^(-)(aq.),, E^(@) = 0.34V`
The cell potential will be

Text Solution

Verified by Experts

`E_("cell")^(0)=E_("cathode")^(0)-E_("anode")^(0)`
`=0.34-(-0.76)=1.10V,DeltaG^(0)=-nFE^(@)`
`-2xx96500xx1.10=-2.123xx10^(-5)J`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ELECTRO CHEMISTRY

    NARAYNA|Exercise W.E-8|1 Videos

  • ELECTRO CHEMISTRY

    NARAYNA|Exercise W.E-9|1 Videos

  • ELECTRO CHEMISTRY

    NARAYNA|Exercise W.E-6|1 Videos

  • 15TH GROUP ELEMENTS

    NARAYNA|Exercise EXERCISE - 4 (NCERT EXEMPLERS/HOTs)|27 Videos

Similar Questions

Explore conceptually related problems

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) to Zn^(2+) (aq) + 2Ag(s) + 2OH^(-)(aq) Determine DeltaG^(@) and E^(@) for the reaction Zn(s) to Zn^(2+) + 2e^(-) , E^(@) = 0.76 V Ag_(2)O + H_(2)O + 2e^(-) to 2Ag + 2OH^(-) E^(@) = +0.34 V

Calculat the equilibrium constant for the reaction, Zn(s)+Ag_(2)O(s)+H_(2)O(l) rarr 2Ag(s)+Zn^(2+)(aq.)+2 OH^(-) (aq.) when E_(cell)^(@)=1.11 at 298 K.

Knowledge Check

  • A button cell used in watches functions as following Zn(s) + Ag _2 O(s) + H_2 O(l) 2 A g(s) + Zn^(2+) (aq) = 2 OH^- (aq) If half cell potentials are Zn^(2+) (aq) +2e^- rarr Zn (s) , E^@ =- 0. 76 V Af_2 O(s) +H_2 O (l) +2e^- rarr 2Ag(s) + 2OH^- (aq) , E^@ =0. 34 V . The cell potential will be .

    A
    ` 0.42 V`
    B
    ` 0. 84 V`
    C
    ` 1.10 V`
    D
    ` 1.34 V`

  • A button cell used in watches functions as follows: Zn(s)+Ag_(2)O(s)+H_(2)O(l)hArr2Ag(s)+Zn^(2+)(aq)+2OH^(-)(aq) The half-cell potential are Zn^(2+)(aq)+2e^(-)toZn(s),E^(@)=-0.76V Ag_(2)O(s)+H_(2)O(l)+2e^(-)to2Ag(s)+2OH^(-)(aq),E^(@)=0.34V The cell potential will be

    A
    1.10 V
    B
    0.42 V
    C
    0.84 V
    D
    1.34V

  • A buttonn cell used in watches function as following Zn(s) +Ag_(2)O(s) +H_(2)O(l) rarr 2Ag(s)+Zn^(2+)(aq)+2OG^(-)(aq), E^(@)=0.34 V the cell potential will be

    A
    1.10 V
    B
    0.42 V
    C
    0.84 V
    D
    1.34 v

    • Similar Questions

    Explore conceptually related problems

    A button cell used in watches function as following Zn(s)+Ag_(2)O(s)+H_(2)O(l)hArr2Ag(s)+Zn^(2+)(aq)+2OH^(-)(aq) if half cell potential are Zn^(2+)(aq)+2e^(-)toZn(s), Ag_(2)O(s)+H_(2)O(l)+2e^(-)to2Ag(s)+2OH^(-)(aq),E^(@)=0.34V The cell potential will be

    The half cell reactions of the cell used in hearing aids are Zn to Zn^(2+)+2e^(-)(E^(0)= +0.76 V) Ag_(2)O+H_(2)O+2e^(-) to 2Ag+2OH^(-)(E^(0) = +0.34 V) E^(0) of the cell is

    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

    The standard electrode potential of the half cells are given below : Zn^(2+)+ 2e^(-) rarr Zn(s), E^(o) = - 7.62 V Fe^(2+) + 2e^(-) rarr Fe(s) , E^(o) = -7 .81 V The emf of the cell Fe^(2+) + Zn rarr Zn^(2+) + Fe will be :

    Consider Delta G^(@) for the following cell reaction : Zn (s) + Ag_(2)O(s)+H_(2)O(l) hArr Zn^(2+)(aq)+2Ag(s)+2OH^(-)(aq) E_(Ag^(+)//Ag)^(@) = +0.80 and E_(Zn^(2+)//Zn)^(@) = - 0.76 V

    Home
    Profile