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Obtain a relation between E(1)^(@), E(2)...

Obtain a relation between `E_(1)^(@), E_(2)^(@) and E_(3)^(@)` , where `E_(1)^(@)=E_(Fe^(2+)|Fe)^(@), E_(2)^(@)=E_(Fe^(3+)|Fe(2+))^(@) & E_(3)^(@)=E_(Fe^(3+)|Fe)^(@)`.

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`Fe^(2+)+2e rarr Fe,DeltaG_(1)^(@)=-nFE_(1)^(@)=-2FE_(1)^(@)" ...[1]"`
`Fe^(3+)+e rarr Fe^(2+), DeltaG_(2)^(@)=-1FE_(2)^(@)" ...[2]"`
`Fe^(3+)+3e rarr Fe, DeltaG_(3)^(@)=-3FE_(3)^(@)" ...[3]"`
Adding equation (1) and (2), we get `Fe^(3)+3e rarr Fe`
and `DeltaG_(1)^(@)+DeltaG_(2)^(@)=DeltaG_(3)^(@)`
`"or, "-2FE_(1)^(@)+(-1FE_(2)^(@))=-3FE_(3)^(@) or, 2E_(1)^(@)+E_(2)^(@)=3E_(3)^(@)" ...[4]"`
Equation (4) gives the relation between `E_(1)^(@), E_(2)^(@) and E_(3)^(@)`.
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