3.3 Consider the system shown in the figure which consists of two tanks connected by a
valve. One tank contains 4 kg of carbon monoxide at 70 °C and 75 kPa. The other tank
holds 10 kg of the same gas at 28 °C and 120 kPa. The valve is opened and the gases
are allowed to mix while receiving energy by heat transfer from the surroundings. The
final equilibrium temperature is 40 °C. Applying the ideal gas model, determine the final
equilibrium pressure. Note that for carbon mononxide: Rs = 0.2968 kJ/kg-K.
Carbon
monoxide
4 kg, 70°C,
75 kPa
Valve
Carbon
monoxide
10 kg, 28°C,
120 kPa