Oxygen has a critical volume of 7.34 x 10^-5 m³ mol^-1. By using the Equation of State P = (R T)/(v (b T)) with b = (v_cr/3) where v_cr is the critical volume, calculate the difference between the specific heat capacity at constant pressure and the specific heat capacity at constant volume at the state (150 K; 2000 kPa).

a		0.098 kJ mol-1 K-1
b		0.394 kJ mol-1 K-1
c		0.104 kJ mol-1 K-1
d		252 J mol-1 K-1