7. Gaseous CO2 is contained in a vertical piston-cylinder assembly by a piston of mass 50 kg and having a face area of 0.01 m?. The mass of the CO2 is 4 g. The CO2 initially occupies a volume of 0.005 m³ and has a specific internal energy of 657 kJ/kg. The atmosphere exerts a pressure of 100 kPa on the top of the piston. Heat transfer in the amount of 1.95 kJ occurs slowly from the CO2 to the surroundings, and the volume of the CO2 decreases to 0.0025 m³. Friction between the piston and the cylinder wall can be neglected. The local acceleration of gravity is 9.81 m/s2. For the CO2 determine (a) the pressure, in kPa, and (b) the final specific internal energy, in kJ/kg.

7. Gaseous CO2 is contained in a vertical piston-cylinder assembly by a piston of mass 50 kg and having a face area of 0.01 m?. The mass of the CO2 is 4 g. The CO2 initially occupies a volume of 0.005 m³ and has a specific internal energy of 657 kJ/kg. The atmosphere exerts a pressure of 100 kPa on the top of the piston. Heat transfer in the amount of 1.95 kJ occurs slowly from the CO2 to the surroundings, and the volume of the CO2 decreases to 0.0025 m³. Friction between the piston and the cylinder wall can be neglected. The local acceleration of gravity is 9.81 m/s2. For the CO2 determine (a) the pressure, in kPa, and (b) the final specific internal energy, in kJ/kg.