A well-insulated rigid tank contains 16 kg of saturated liquid-vapor H2O mixture of quality20% at 100 kPa. An electric heater inside the tank is turned on and kept on until

all the liquid is vaporized. Please determine the work done by the electric heater during this process. Please determine the entropy change of the water during this process. Please also find the entropy generation in this process. Will it be positive or negative? Explain!