A rigid tank with a total volume of 0.05 m3 initially contains a two-phase liquid-vapor mixture of water at a pressure of 15 bar and a quality of 0.2. The tank is heated at a constant rate while a pressure-regulating valve is used to maintain a constant tank pressure by allowing saturated vapor to escape. Kinetic and potential energy effects can be neglected. If the tank is heated until the quality reaches 0.5, determine the final mass (kg) within the tank and the total amount of heat transfer required (kJ).