1.

Given E_(Fe^(3+)//Fe)^(o)=-0.036V,E_(Fe^(2+)//Fe)^(o)=-439V the value of standard electrode potential for the change, Fe_((aq))^(3+)+e^(-)toFe^(2+)(aq) will be

Answer»

`-0.072V`
`0.385V`
`0.770V`
`-0.270V`

Solution :`Fe^(3+)+3e^(-)TOFE,DeltaG_(1)=-3xxFxxE_(Fe^(3+)//Fe)^(0)`
`Fe^(+2)+2e^(-)toFe,DeltaG_(2)=-2xxFxxE_(Fe^(2+)//Fe)^(0)`
`Fe^(3+)+E^(-)toFe^(2+),DeltaG=DeltaG_(1)-DeltaG_(2)`
`DeltaG=3xx0.036F-2xx0.439xxF=-1xxE_((Fe^(3+)//Fe^(+2)))^(o)xxF`
`E_((Fe^(3+)//Fe^(+2)))^(o)=2xx0.439-3xx0.036`
`=0.878-0.108=0.770V`


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