In the first question, why isn't adiabatic?

Problem 2 (10 pts) Is an adiabatic expansion of air from 300kPa (absolute) and 95C, to 150kPa (absolute) and 25C possible? Justify your answer. Problem 3 (15 pts) For a calorically perfect gas derive the following expressions for the equation of state: (a) p=p(s,T) (b) =(s,T) (c) p=p(,s) Use reference conditions p0,0,s0,T0 as necessary