In addition to hydrogen, methane also has been studied for use in PEM fuel cells.

4. In addition to hydrogen, methane also has been studied for use in PEM fuel cells. Balance the given oxidation and reduction half reactions, and write the overall equation for a methane-based fuel cell. (4 points)

             a. Oxidation half reaction:          ___ CH4(g) + ___ H2O(l) → ___CO2(g) + ___H+(aq) + ___e—

             b. Reduction half-reaction:       ___O2(g) + ___H+(aq) + ___e- → ___H2O

5. Hydrogen and methane both can react with oxygen in a fuel cell. They can also be burned directly. Which has greater heat content when burned, 1.00g of H2 or 1.00g of CH4? (Hint: Write the balanced chemical equation for each reaction and use the bond energies in Table 5.1 to help answer this.) (6 points)

6. After reading this chapter, which battery source do you think is the most efficient and most effective for your daily activities? Explain. (3 points)