Given the half-cell reactionsi Fe2- aq - 2e- - Fes- E0 - -0-44 Vii 2H- aq - 12 O2 g - 2e- - H2Ol- E0 - - 1-23 VE0 for the reactionFes - 2H-aq - 12O2g - Fe2-aq - H2Ol is

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Nucleophilic Substitution in Alkyl Halides

Given the hal...

Question

Given the half-cell reactions
i) $F e^{2 +} (a q) + 2 e^{-} \to F e (s); E^{0} = - 0.44 V$
ii) $2 H^{+} (a q) + \frac{1}{2} O_{2} (g) + 2 e^{-} \to H_{2} O (l); E^{0} = + 1.23 V$
$E^{0}$ for the reaction
$F e (s) + 2 H^{+} (a q) + \frac{1}{2} O_{2} (g) \to F e^{2 +} (a q) + H_{2} O (l)$ is

- 1.67 V

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+ 1.67 V

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- 0.77 V

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+ 0.77 V

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Solution

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E^{0}

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

E^{0}

F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = 0.77 V

F e^{2 +} (a q) + 2 e^{-} \to F e (s); E^{0} = - 0.44 V

F_{2} (g) + 2 e^{-} \to 2 F^{-} (a q); E^{0} = 2.87 V C l_{2} (g) + 2 e^{-} \to 2 C l^{-} (a q); E^{0} = 1.36 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = 0.77 V

M^{2 +} / M and M^{3 +} / M^{2 +}

E^{0}

C r^{2 +} (a q) + 2 e^{-} \to C r (s); E^{0} = - 0.91 V C r^{3 +} (a q) + e^{-} \to C r^{2 +} (a q); E^{0} = - 0.41 V

M n^{2 +} (a q) + 2 e^{-} \to M n (s); E^{0} = - 1.2 V M n^{3 +} (a q) + e^{-} \to M n^{2 +} (a q); E^{0} = + 1.51 V

F e^{2 +} (a q) + 2 e^{-} \to F e (s); E^{0} = - 0.44 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = + 0.77 V

F_{2} (g) + 2 e^{-} \to 2 F^{-} (a q); E^{0} = 2.87 V C l_{2} (g) + 2 e^{-} \to C l^{-} (a q); E^{0} = 1.36 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = 0.77 V

F_{2} (g) + 2 e^{-} \to 2 F^{-} (a q); E^{0} = 2.87 V C l_{2} (g) + 2 e^{-} \to C l^{-} (a q); E^{0} = 1.36 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = 0.77 V

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