4. (20%) Gaseous acetylene (C2H2) reacts with the stoichiometric amount of oxygen in a fuel cell. The fuel cell operates at 25 C. The fuel and the pure oxidant each enters the cell at 1 atm pressure. Assume that CO2 is removed from the anode pure at 1 atm pressure, and that liquid water is removed at the cathode. Determine (a) the maximum work that could be obtained from the steady flow device (kJ/kmol of fuel), (b) the ideal efficiency, (c) the heat transfer required (kJ/kmol of fuel], and (d) the reversible potential of the cell [V]