The rigid tank in the figure below has a volume of 60 L and initially contains a two-phase liquid vapor mixture of H20 at a pressure of 15 bars and a quality of 20%. As the tank contents are heated, a pressure-regulating valve keeps the pressure constant in the tank by allowing saturated vapor to escape. Heating continues until no liquid remains in the tank. Neglecting kinetic and potential energy effects, determine
a) The amount of heat transfer in kJ
b) The mass of the vapor that escapes in kg