$3\mathrm{.}85$ As shown in Fig. P$3\mathrm{.}85,0\mathrm{.}5$ kg of ammonia is contained

in a piston$-$cylinder assembly, initially at $T_1=-20C$ and a

quality of $25\%.$ As the ammonia is slowly heated to a final

state, where $T_2=20C,p_2=0\mathrm{.}6$MPa, its pressure varies

linearly with specific volume. There are no significant kinetic

and potential energy effects. For the ammonia, $($a$)$ show the

process on a sketch of the $p-v$ diagram and $($b$)$ evaluate the

work and heat transfer, each in kJ$.$

Initially,

$T_1=-20C,x=25\%$

Finally,

$T_2=20C,p_2=0\mathrm{.}6$MPa