The hydrogen-oxygen fuel cell is described in the text. For the questions below, assume the following:

Assume that the air is 20 % O₂ by volume and that all the O₂ is consumed in the cell. The other components of air do not affect the fuel-cell reactions. Assume ideal gas behavior.

What volume of H₂(g), stored at 25.0°C at a pressure of 155 atm, would be needed to run an electric motor drawing a current of 8.50 A for 3.00 hr ?