Solve the below problem:
Q: The refrigerant R-22 is contained in a piston/cylinder, where the volume is 11 L when the piston hits the stops, the initial state is -30°C, 150 kPa with a volume of 10 L. This system is brought indoors and warms up to 15°C.
a. Is the piston at the stops in the final state?
b. Find the work done by the R-22 during this process.