A vertical piston–cylinder device initially contains 0.25 m3 of air at 600 kPa and 300°C....

A vertical piston–cylinder device initially contains 0.25 m³ of air at 600 kPa and 300°C. A valve connected to the cylinder is now opened, and air is allowed to escape until three-quarters of the mass leave the cylinder at which point the volume is 0.05 m³. Determine the final temperature in the cylinder and the boundary work during this process.