If E Fe 2- -Fe o -0-44V- E Fe 3- - Fe 2- o -0-77V- Calculate E o Fe 3- -Fe o

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If E Fe 2+ ...

Question

If $E_{{F e}^{2 +} | F e}^{o} = - 0.44 V$ , $E_{{F e}^{3 +} | {F e}^{2 +}}^{o} = - 0.77 V$ . Calculate $E_{{{F e}^{3 +} | F e}^{o}}^{o}$

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E_{{F e}^{2 +} / F e}^{o} = - 0.44 V E_{{F e}^{3 +} / {F e}^{2 +}}^{o} = 0.77 V

F e + 2 {F e}^{3 +} \to 3 {F e}^{2 +}

E^{o} :

E_{F e^{2 +} | F e}^{\circ} = - 0.04 V

E_{F e^{3 +} | F e^{2 +}}^{\circ} = 0.77 V

E_{F e^{3 +} | F e^{+}}^{\circ}

E_{F e^{3 +} / F e}^{o} = - 0.036 V, E_{F e^{2 +} / F e}^{o} = - 0.439 V

F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q)

E_{C r^{3 +} |}^{o}

_{Cr}

= - 0.72 V, E_{F e^{2 +} | F e}^{o} = - 0.42

| C r^{3 +} (0.1 M) ∥ F e^{2 +} (0.01 M) |

E^{o}

E_{{F e}^{3 +} / {F e}^{2 +}} = + 0.76 V

E_{{F e}^{2 +} / {F e}} = - 0.44 V

E_{{S n}^{2 +} / {S n}} = - 0.14 V

3 {S n}_{(s)} + 2 {F e}^{3 +} (a) \to 2 F e (a q) + 3 {S n}^{2 +} (a q)

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