2- A rigid tank contains 0.5 kg of oxygen (O,) initially at 30 bar and 200 K. The gas is cooled and the pressure drops to 20 bar. Determine the volume of the tank, in m', and the final temperature, in K. 3 Useful I data: y = C/C 1.4 Gas Molar mass- M-, kg/k mol Air 28.97 oxygen 32 1.4 Butane (CH10) 58 1.1 1.4 1.32 Nitrogen (N;) 28 Methane (CH,) 16 Universal gas constant = 8.314 kJ / kmol. K 1 bar = 100 kPa For liquid waterh = 4.18 *t, kJ/kg where t in C Water density 1000 kg/m