Air in an insulated piston cylinder is initially at 300K and 100 kPa. The air is allowed to expand isentropically until the air’s specific volume reaches 2.0 m
/kg. How much work per mass (kJ/kg) is produced during the expansion? Use the IG model (variable specific heat) to calculate the answer.
a) 156.6 kJ/kg
b) 61.4 kJ/kg
c) 32.3 kJ/kg
d) -32.3 kJ/kg