4. The conditions of a gas change in a steady-flow process from 20 °C and 1000 kPa to 60 °C and 100 kPa. Devise a reversible non-flow process (any number of steps) for accomplishing this change of...

Show complete solution and box all final answers. Observe and show all proper units.

Extracted text: 4. The conditions of a gas change in a steady-flow process from 20 °C and 1000 kPa to 60 °C and 100 kPa. Devise a reversible non-flow process (any number of steps) for accomplishing this change of state and calculate AU and AH for the process on the basis of 1 mol of gas. Assume for the gas that PV/T is constant, Cv = (5/2)R and CP = (7/2)R. %3D 5. In the following take Cv = 20.8 and Cp = 29.1 J/mol-°C for nitrogen gas. (a) Three moles of nitrogen at 30 °C, contained in a rigid vessel, is heated to 250 °C. How much heat is required if the vessel has a negligible heat capacity? If the vessel weighs 100 kg and has a heat capacity of 0.5 kJ/kg-°C, how much heat is required? (b) Four moles of nitrogen at 200 °C is contained in a piston/cylinder arrangement. How much heat must be extracted from this system, which is kept at constant pressure, to cool it to 40 °C if the heat capacity of the piston and cylinder is neglected? %3D