An oxygen gas R = 0.2598 KJ/kg°k and k = 1.395. If 4 kg of oxygen undergoes a reversible non-flow constant pressure process from initial volume =1.2 cubic meter and initial pressure = 690 kPa to a state where final temperature = 600°C. a.) What is the initial temperature? b.) Determine the constant volume specific heat. c.) Determine the Change in Internal Energy. d.) Determine the constant pressure specific heat. e.) Determine the Change in Enthalpy.

m= 1 kg Process path (straight line) R= 0.50 2 C, = 0.5 kJ/kg K P V= 1 m3 P= 300 kPa V= 0.5 m3 P= 600 kPa An ideal gas in a piston undergoes a process from state 1 to state 2 above. d) The work to move the piston is: a) performed ON the system (Win) b) performed BY the system (Wout) e) If no other work is done on or by the system during the process, circle the term that must be non-zero (i.e. what else occurs during the process) to satisfy the Conservation of Energy Equation for a closed system having no change in KE or PE. W - W, + Qin - Qout = AU in out

A power cycle consisting of the three processes: Process 1-2: Constant volume to P2 Process 2-3: Polytropic expansion Pv=c, use k=1.28 Process 3-1: Compression at constant pressure Assuming 2.5 kg carbon dioxide as the working substance with P₁= 1.5 bar, P₂= 6 bar, T₁=350 K and neglecting kinetic and potential energy effects: a) sketch cycle in P-v diagram b) calculate thermal efficiency CO₂ molar mass = 44. CO₂ specific heat cy=1.014 kJ/kg/K

For open systems, entropy can be transferred by a) heat transfer only. b) mass transfer only. c) both heat and mass transfer.