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Fuel Cells

a Calculate Δ...

Question

(a) Calculate $Δ_{r} G^{0}$ for the reaction
$M g (s) + C u^{2 +} (a q) \to M g^{2 +} (a q) + C u (s)$

Given : $E_{c e l l}^{0} = + 2.71 V, 1 F = 96500 C m o l^{- 1}$

(b) Name the type of cell which was used in Apollo space programme for providing electrical power.

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Solution

(a) $Δ_{r} G^{0} = - n F E_{c e l l}^{0}$

Here, n=2

$∴ Δ_{r} G^{0} = - 2 \times 96500 \times 2.71$

$= - 523030 J$

$= - 523.03 K J$

(b) $H_{2} - O_{2}$ Fuel cell.

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Δ_{r} G^{0}

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E_{c e l l}^{0} = 2.71 V, 1 F = 96500 C {m o l}^{- 1}

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