For storage options a, b, and c, what volume of storage tank forhydrogen would be needed for a hydrogen fuel cell car to have thesame delivered transport energy (that is, total vehicle-km oftravel) as a conventional car with a full 50 litre petrol tank(note that the actual volume of the tank is more than 50 litre). a-If the hydrogen is stored as compressed gas at a pressure of 350bar (1 bar = 101 kPa) b- If the hydrogen is stored cryogenically asa liquid c- If the hydrogen is stored in a metal hydride in solidform Important assumption and information required to answer thisquestion: • The energy content of hydrogen (HHV) is 142 MJ/kg (~40kWh/kg)The average energy efficiency of the fuel cells used is 44%(based on HHV), and that of the electric motors 86%. • Note thatthe following gravimetric and volumetric energy storage figures arebased on 50% fuel cell energy efficiency, but the energy efficiencythat you need to use (based on question 2) in order to answer thisquestion is 44%, HHV. Assumptions for the volumetric andgravimetric electrical energy densities of different hydrogenenergy storage options based on 50% electrical energy efficiency(HHV) for the fuel cell: - High-pressure hydrogen at 350 bar: 0.75kWhe/kg and 0.35 kWhe/litre - Cryogenic hydrogen storage 1.46kWhe/kg and 0.89 kWhe/litre - Metal hydride 0.5 kWhe/kg and 0.5kWhe/litre.