\1. The problem statement, all variables and given/known data Air is compressed in a piston-cylinder assembly from p1 = 10 lbf/in2, T1 = 500°R to a final volume of V2 = 1ft3 in a process described by pv1.25 = constant. The mass of air is 0.5 lb. Assuming ideal gas behavior and neglecting kinetic and potential energy effects, determine the work and heat transfer, each in Btu, using a) constant specific heats evaluated at 500°R and b) data from the table. Compare the results The table is titled 'Ideal Gas properties of air 2. Relevant equations Cv = constant pv = nRT Q = ΔE + W E = U + KE + PE W = ∫P dv 3. The attempt at a solution I'm not sure where to begin with this question. I think I need to find the initial volume first but I'm not sure what the best way to do this is. I had thought to use: pv = nRT But then I'd have to convert my 0.5 lb of air into moles which would require me to convert everything else into English units. Is there a simpler way?