1. A cylindrical tank that is initially empty is 12 ft wide and has a height of 9 ft. It is fitted with an orifice at the bottom and the orifice's radius measures 1/2 in. If water enters through the top of the tank at the rate of how long would it take the fill the tank to its full capacity? Express your answer in minutes (min) 2. A liter flask is filled with air. Hydrogen enters the flask through a tube and gas leaves the flask at the same rate through another tube. What will be the concentration of hydrogen in the flask after the passage of 3 L of hydrogen