18. Air (N, = 77%, 0, = 23% by weight) at 20°C and 10 bar is contained in a vessel of capacity of 0.5 m². Some quantíty of carbon dioxide is forced into the vessel so that the temperature remains at...

Extracted text: 18. Air (N, = 77%, 0, = 23% by weight) at 20°C and 10 bar is contained in a vessel of capacity of 0.5 m². Some quantíty of carbon dioxide is forced into the vessel so that the temperature remains at 20°C but the pressure rises to 15 bar. Find the masses of oxygen, nitrogen and earbon dioxide in the cylinder. The universal gas constant is 8.3143 kJ/kg K. (Ans. 1.35 kg, 4.54 kg, 4.51 kg)