One kilogram of steam is contained in a pistonlcylinder device at 800 kPa and 473.15 K (200°C).
(a) If it undergoes a mechanically reversible, isothermal expansion to 150 kPa, how much heat does it absorb?
(b) If it undergoes a reversible, adiabatic expansion to 150 kPa, what is its final temperature and how much work is done?