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Q.

Calculate the standard voltage that can be obtained from an ethane oxygen fuel cell at $25^{\circ} C$
$C_{2} H_{6} (g) + 7 / 2 O_{2} (g) \overset{}{\to} 2 {CO}_{2} (g) + 3 H_{2} O (l);$ $ΔG º = - 1467 kJ$

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a

+1.08

b

+0.54

c

+0.72

d

+0.91

answer is D.

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Detailed Solution

$n = 2 \times no . of oxygen atoms$

$= 2 \times 2 \times \frac{7}{2} = 14 e^{-}$

$ΔG º = - nFE º$

$E º = \frac{- 1467 \times 1000}{- 14 \times 96500} = + 1.08$

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