As shown in the figure below $($next page$),$ Refrigerant $134$a is contained in a piston$-$cylinder

assembly, initially as a saturated vapor. The refrigerant is slowly heated until its temperature is

$16EC.$ During the process, the piston moves smoothly in the cylinder. For the refrigerant,

$($a$)$ Sketch both T$-$V and P$-$V diagrams

$(10$ marks$)$

$($b$)$ Evaluate the work, in $k\frac{J}{k}g.$