Problem: Direct methanol fuel cells (DMFCs) 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 DMFCs:CH3OH (l) + 3/2O2 (g) → CO2 (g) + 2H2O (l)Use values of ΔG°f from Appendix 4.

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CH3OH (l) + 3/2 O2 (g) → CO2 (g) + 2H2O (l)


G°rxn=G°products-G°reactantsG°rxn=[1 mol-394 kJmol+2 mol-237kJmol]                  -[1 mol(-166 kJmol)+3/2 mol(0kJmol)]

ΔG°rxn = -702 kJ/mol


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Problem Details

Direct methanol fuel cells (DMFCs) 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 DMFCs:

CH3OH (l) + 3/2O2 (g) → CO2 (g) + 2H2O (l)

Use values of ΔG°f from Appendix 4.