1. An experimental PEM fuel cell operates at a temperature of 80°C and a pressure of 1 atm. Consider a single cathode channel of this fuel cell as shown: 1 mm Airflow passage to cathode 1 mm cathode <5 mm depth in paper 2 mm The dimensions of the channel are: area: length: 1 mm² 5 mm The width of the MEA that corresponds to a single channel is 2 mm. For a stoichiometric flow ratio of 2-2 calculate: (a) The amount of oxygen entering the channel for a current density of 1.0 A/cm² in moles/sec and kg/sec, (b) The amount of dry air entering in moles/sec and kg/sec assuming molar nitrogen to oxygen ratio of 79/21. (c) The volumetric flow rate of air in m³/s and the inlet bulk velocity of the air in m/s assuming ideal gas behavior. (30)