A rigid tank initially contains 100 L of saturated-liquid R-12 and 100 L of saturated-vapor R-12 at 0C. A valve on the bottom of the tank is connected to a line flowing R-12 at 10C, 900 kPa. A pressure-relief valve on the top of the tank is set at 745 kPa (when tank pressure reaches that value, mass escapes such that the tank pressure cannot exceed 745 kPa). The line valve is now opened, allowing 10 kg of R-12 to flow in from the line, and then this valve is closed.
Heat is transferred slowly to the tank, until the final mass inside is 100 kg, at which point the process is stopped.
a) How much mass exits the pressure-relief valve during the overall process?
b) How much heat is transferred to the tank?