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Calculate the 25^@C the equilibrium cons...

Calculate the `25^@C` the equilibrium constnat for the reaction:
`2Fe^(3+)+Sn^(2+)Leftrightarrow2Fe^(2+)+Sn^(4+)`
Given that: `E_(Fe^(3+)+Fe^(2+))`, Pt=0.771V, `E_(Sn^(4+)|Sn^(2+))` Pt=0.150V.

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