A system consists of carbon monoxide (CO) in a piston- cylinder assembly, initially at P1= 200 lbf/in^2 , and occupying a volume of 2.0m^3 . The carbon monoxide expands to P2= 40 lbf/in^2 and a final volume of 3.5m^3 . During the process, the relationship between pressure and volume is linear. Determine the volume, in ft^3 , at an intermediate state where the pressure is 150 lbf/in^2 , and sketch the process on a graph of pressure versus volume.