Question

A box shaped close system with a movable top contain water as working as fluid was kept a temperature of 293 K. The pressure inside at this state was 100

kPa. Weights are placed on the movable top to maintain a constant pressure on the water. Later the box was supplied heat energy so that the temperature inside reached to 673 K. How much work does the working fluid inside did on the movable top?

Fig: 1