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`{:(Given Fe^(+2)+2e^(-)toFe(s),,,,E^(@)=-0.447V),(Fe^(+2)toFe^(+3)+e^(-),,,,E^(@)=-0.771V):}` Find `E^(@)` for the reaction `Fe^(+3)+3e^(-)toFe(s)`A. 0.34VB. `-0.041V`C. `+0.39V`D. `-0.47V`

Answer» Correct Answer - B
`Fe^(+2)+2e^(-)toFe(s)DeltaG_(1)^(0)=-2FE_(1)^(0)`
`Fe^(+2)toFe^(+3)+e^(-)DeltaG_(2)^(0)=-1E_(2)^(@)`
`Fe^(+3)+3e^(-)toFe(s)DG_(3)^(0)=-3FE_(3)^(@)`
`DeltaG_(3)^(@)=DeltaG_(1)^(@)-DeltaG_(2)^(@)`
`-3E_(3)^(@)=2xx0.447-1xx0.771`
`E_(3)^(@)=-0.041 V`


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