Direct propanol fuel cells (DPFCs) have shown some promise as a viable option for providing "green" energy to small electrical devices. Calculate E° for the reaction that takes place in DPFCs:

C3H7OH(l) + 9/2 O2(g) → 3CO2(g) + 4H2O(l)

Use the following values.

∆G°H2O(l) = -237 kJ/mol
∆G°O2(g) = 0 kJ/mol
∆G°CO2(g) = -394 kJ/mol