Calculate the standard cell potentials from the standard free energy changes (you may find the values from available references) for the following fuel cells: (i) H/0, (ii) methanol/O, (iii) ethanol/O, and (iv) glucose/O. Assume that the fuels are completely oxidized and the products of the reactions are water for H/0 fuel cells, and carbon dioxide / water for the carbonaceous fuel/0 fuel cells.