QUESTION II: 0.5 m³ of air at T1 = 67 °C, P1 = 700 kPa undergoes a polytropic expansion to a final pressure of 350 kPa. The process follows pV13 constant and the work done by the air is 175 kJ. Assuming ideal gas behavior for the air, and neglecting kinetic and potential energy effects, determine: (a) the final temperature, in °C. (b) the heat transfer, in kJ. Air

This question requires the use of the Thermodynamic Property Tables supplied asadditional material.In addition, for steam, the specific ideal gas constant = 461.5 J/kg KA closed system is comprised of pure water substance initially at a temperature of 500 C and a pressure of 20 MPa (state 1).The system undergoes an isochoric process whereby its pressure drops to 0.1 Mpa (state 2). (d) For state 1 evaluate the specific volume assuming the steam behaves as an ideal gas and comment on your result.

letter d

Water is contained in a closed, rigid, 0.25 m3 tank at an initial pressure of 500 kPa and a quality of 80%. Heat transfer occurs until the tank contains only saturated vapor. Determine: (a) the fifinal pressure, in bar.  (b) amount of heat transferred to the system.