What is the cell potential standard emf- Eo for the reaction below - -EoFe2-aq-Fe-0-44 V and Eo O2g-H2O-OH- - 0-4 V- 2Fes-O2g-2H2Ol - 2Fe2-aq-4OH-aq

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Electrochemical Cells, Galvanic Cells

What is the c...

Question

What is the cell potential (standard emf, $E^{o}$ ) for the reaction below ?
$[E_{(F e^{2 +} (a q) / F e)}^{o} = 0.44 V$ and
$E_{(O_{2} (g) / H_{2} O / O H^{-})}^{o} = + 0.4 V]$

$2 F e (s) + O_{2} (g) + 2 H_{2} O (l) ⇋ 2 F e^{2 +} (a q) + 4 O H^{-} (a q)$

E^{o}

cell = - 0.48 V

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E^{o}

cell = - 0.04 V

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E^{o}

cell = + 0.84 V

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E^{o}

cell = + 1.28 V

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2 F e (s) + O_{2} (g) + 4 H^{+} (a q) \to 2 F e^{2 +} (a q) + 2 H_{2} O (l); E^{o} = 1.67 V

[F e^{2 +}] = 10^{- 3} M, P_{O_{2}} = 0.1

p H = 3

^{o} C

Z n^{2 +} (a q) + 2 e^{-} ⇌ Z n (s); E^{o} = - 0.762 V

C r^{3 +} (a q) + 3 e^{-} ⇌ C r (s); E^{o} = + 0.762 V

2 H^{+} (a q) + 2 e^{-} ⇌ H_{2} (g); E^{o} = + 0.00 V

F e^{3 +} (a q) + e^{-} ⇌ F e^{2 +} (a q); E^{o} = + 0.770 V

(E^{o})

Z n = Z n^{2 +} + 2 e^{-}

E^{o} = + 0.76

F e = F e^{2 +} + 2 e^{-}

E^{o} = + 0.41

F e^{2 +} + Z n \to Z n^{2 +} + F e

298 K

N i^{2 +} (a q) + 2 e^{-} \to N i (s); E^{o} = - 0.28 V

M g^{2 +} (a q) + 2 e^{-} \to M g (s); E^{o} = - 2.37 V

N O_{3}^{-}

E^{o}

0.96 V

E^{o}

V^{2 +} (a q) + 2 e^{-} \to V; E^{o} = - 1.19 V F e^{3 +} (a q) + 3 e^{-} \to F e; E^{o} = - 0.04 V A u^{3 +} (a q) + 3 e^{-} \to A u; E^{o} = 1.40 V H g^{2 +} (a q) + 2 e^{-} \to H g; E^{o} = + 0.86 V

N O_{3}^{-}

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