3. For the fuel cell described above in problem 2 , assuming operation on pure hydrogen fuel, how much water would be produced during 24 hours of operation at P=2kW ? (Recall: molar mass of water =18g/mol, density of water =1g/cm3.) (a) 0.49L (b) 10.7L (c) 32.2L (d) 66.3L 4. Assuming 100% fuel utilization, how much current can a fuel cell produce if provisioned with 5sccmH2 gas at STP? (1 sccm = 1 standard cubic centimeter per minute.) Assume sufficient oxidant is also supplied. 5. A fuel cell operates for 1 hour at 2A current load and then operates for 2 more hours at 5A current load. Calculate the total number of moles of H2 consumed by the fuel cell over the course of this operation. To what mass of H2 does this correspond? Assume 100% fuel utilization