1.

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

Answer»

1.10 V
0.42 V
0.84 V
1.34V

Solution :`E_(CELL)^(@)=E_("CATHODE")^(@)-E_("ANODE")^(@)=0.34-(-0.76)V=1.10V`


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