Could you please explain what you are doing$/$where you are gathering values from because I still don't fully understand what is happening

A piston$-$cylinder device contains $2\mathrm{.}8$ kg of water, initially at $200$ kPa and $1\mathrm{.}95m^3.$ A $2000$ W electric resistance heater inside the cylinder is then turned on and the water is heated under constant pressure conditions until the temperature inside the cylinder reaches $400C.$ Assuming negligible heat loss during the heating process, calculate the

a$)$ Total time the heater was on during the energy addition process

b$)$ Final volume

c$)$ Change in entropy $(k\frac{J}{K})$ during the heating process