1) A cylinder contains 0.020 m3 of molecular oxygen at a temperature of 25C and a pressure of 15 atm. What would be the volume of this gas at a pressure of one atmosphere? A patient breathes this oxygen through a mask at a rate of 0.0080 m3/minute at atmospheric pressure. After how long will the cylinder be empty if its pressure will be 1 atm?

2) Suppose that we can convert all the internal energy of a mole of ideal diatomic gas at 20C into mechanical energy. How high could a mass of 1 kg be lifted?