It is desired to obtain a supply of cold helium gas by the following technique: helium contained in a cylinder at ambient conditions, 100 kPa, 25°C, is compressed in an isothermal process to 700 kPa, after which the gas is expanded back to 100 kPa in an adiabatic process, Both processes are reversible. (a) Show the process on a T-s diagram. (b) Calculate the final temperature and net work per kg. (c) If a diatomic gas had been used instead of helium, would the final temperature be higher or lower?