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Calculate E°cell (in volts) for a fuel cell that employs the reaction between methane gas and oxygen to form carbon dioxide and water. (to 4 significant figures)
∆G⁰f for CH4 = -50.5 kJ/mol
∆G⁰f for CO2 = -394.4 kJ/mol
F = 96485/mol e-

I got 0.4455 V when i tried.

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