A closed system consisting of 2 lb of a gas undergoes a process during which the relation

Question:

A closed system consisting of 2 lb of a gas undergoes a process during which the relation between pressure and volume PVn = constant, the process begins with P1= 20 lbf/in.2, V2= 2 .9 ft3. Determine
(a) The value of n and
(b) The specific volume at states 1 and 2, each in ft3/lb.
(c) Sketch the process on pressure volume coordinates.