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Standard free energies of formation (in kJ/mol) at 298 K are -237.2, -394.4 and -8.2 for H2O(l), CO2(g) and pentane (g), respectively. The value of E°cell for the pentane-oxygen fuel cell is:

1. 1.968 V
2. 2.0968 V
3. 1.0968 V
4. 0.0968 V

Correct answer: 2.0968 V

Solution

The standard free energy change (ΔG°) for the reaction can be calculated using the given free energies of formation. Then, E°cell is determined using the relation ΔG° = -nFE°. After solving, the value of E°cell is approximately 2.0968 V.

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