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 3 kg how much work per mass kj kg is produced during the expansion use the ig model vari

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

3

/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