**CH _{3}OH (l) + 3/2 O_{2} (g) → CO_{2} (g) + 2H_{2}O (l)**

$\overline{){\mathbf{\u2206}}{\mathbf{G}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{\u2206}}{\mathbf{G}}{{\mathbf{\xb0}}}_{{\mathbf{products}}}{\mathbf{-}}{\mathbf{\u2206}}{\mathbf{G}}{{\mathbf{\xb0}}}_{{\mathbf{reactants}}}}\phantom{\rule{0ex}{0ex}}\mathbf{\u2206}\mathbf{G}{\mathbf{\xb0}}_{\mathbf{rxn}}\mathbf{=}[1\overline{)\mathrm{mol}}\left(-394\frac{\mathrm{kJ}}{\overline{)\mathrm{mol}}}\right)+2\overline{)\mathrm{mol}}\left(-237\frac{\mathrm{kJ}}{\overline{)\mathrm{mol}}}\right)]\phantom{\rule{0ex}{0ex}}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{-}\mathbf{[}\mathbf{1}\mathbf{}\overline{)\mathbf{mol}}(-166\frac{\mathrm{kJ}}{\overline{)\mathrm{mol}}})\mathbf{+}\mathbf{3}\mathbf{/}\mathbf{2}\mathbf{}\overline{)\mathbf{mol}}\left(0\frac{\mathrm{kJ}}{\overline{)\mathrm{mol}}}\right)\mathbf{]}$

**ΔG° _{rxn }= -702 kJ/mol**

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:

CH_{3}OH (l) + 3/2O_{2} (g) → CO_{2} (g) + 2H_{2}O (l)

Use values of ΔG°_{f} from Appendix 4.

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