An insulated rigid tank is initially filled with a saturated liquid-vapor mixture of water. Initially three-quarters of the mass is in the liquid phase, the mass is 10 lbm, and the pressure is 15 psia. An electric heater in the tank is turned on, and the entire liquid in the tank is vaporized. How much work does the electric heater have to supply to the system. Show the process on a T-v diagram with respect to the saturation lines.