A frictionless piston-cylinder device initially contains air at 200 kPa and 0.2 m3. At this state, a linear spring is touching the piston but exerts no force on it. The air is then heated to the final state of 0.5 m3 and 800 kPa. a. Sketch the process on a p-V diagram b. Determine the total work done by the air c. Determine the work done against the spring.