A piston$-$cylinder device initially contains $1\mathrm{.}4$ kg saturated liquid water at $200C.$ The liquid water completely evaporates to form saturated water vapor, and during this process, the volume becomes $4\mathrm{.}28$ times its initial value.

a$)$ Find the initial and the final volumes of the tank.

b$)$ Find the final temperature and pressure.

c$)$ Find the change of enthalpy during this process.