thermodynamics 1. chapter 1

Problem 2 (10 points): A 2ft3 rigid tank contains wet steam at 10 bar such that 5% of the volume is occupied by the liquid and rest by vapor. A valve at the top of the tank is opened to allow the vapor to escape slowly from the tank and heat is transferred to the tank such that the pressure remains constant. The valve is closed when the last drop of the liquid is vaporized and only saturated vapor remains in the tank. Determine the mass of water vapor finally in the tank and the amount of heat transferred to the tank for each of the following cases. (i). Assume that the water vapor is an ideal gas. Use the specific heat relation ant Antoine equation for water vapor in Appendix E of the textbook. (ii). Use only the steam tables given in Appendix E. Briefly comment on reasons for differences or similarities when compared to the values found assuming an ideal gas. Problem 2 (10 points): A 2ft3 rigid tank contains wet steam at 10 bar such that 5% of the volume is occupied by the liquid and rest by vapor. A valve at the top of the tank is opened to allow the vapor to escape slowly from the tank and heat is transferred to the tank such that the pressure remains constant. The valve is closed when the last drop of the liquid is vaporized and only saturated vapor remains in the tank. Determine the mass of water vapor finally in the tank and the amount of heat transferred to the tank for each of the following cases. (i). Assume that the water vapor is an ideal gas. Use the specific heat relation ant Antoine equation for water vapor in Appendix E of the textbook. (ii). Use only the steam tables given in Appendix E. Briefly comment on reasons for differences or similarities when compared to the values found assuming an ideal gas