$4-41$ A piston$-$cylinder device initially contains $0\mathrm{.}6m^3$ of saturated

water vapor at $250$ kPa $.$ At this state, the piston is resting on a set of

stops, and the mass of the piston is such that a pressure of $300$ kPa is

required to move it$.$ Heat is now slowly transferred to the steam until the

volume doubles. Show the process on a $P-$ v diagram with respect to

saturation lines and determine $($a$)$ the final temperature, $(b)$ the work done

during this process, and $($c$)$ the total heat transfer. Answers: $($a$)662C,($b$)$

$180kJ,(c)910kJ$