An insulated rigid tank contains 2.1 kg of water at 150 degress C, initially. At this state, 1.49 kg of the water is in liquid phase. Now, a 1200W electric heater is placed in the tank and left on until the tank is observed to have saturated vapor only as the final state. Calculate a) volume b) final temp of steam and c) time the heater was left on to reach the final state.