6. Hydrogen/Oxygen Fuel Cells. An inventor wants to build a hydrogen manometer based on the dependence of the output voltage of an H2/O2 fuel cell on the pressure of the reactants. Take a fuel cell operating at 298K and 1atm. Assume that it produces water vapor and that the open circuit voltage is that of an ideal cell. The oxygen pressure is maintained at a constant 0.1MPa while the hydrogen pressure, pH2 is the quantity to be measured. It will also be useful to know that the free energy of formation for H2O(g) 2H2+O22H2O(g) under these temperature and pressure conditions is 228.6kJmol1. What is the output open cell voltage (a) at P=0.1MPa (b) 1MPa ? Is this going to be a useful manometer