$2\mathrm{.}155$ Consider $1\mathrm{.}36$ kg of $H_{2}O($liquid and vapor in equilibrium$)$ contained in a

vertical piston$-$cylinder arrangement at $50C,$ as shown in the sketch. Ini$-$

tially, the volume beneath the $113\mathrm{.}4-kg$ piston $($area $11\mathrm{.}15c{m}^2)$ is $0\mathrm{.}03m^3.$

With an atmospheric pressure of $101\mathrm{.}325$kPa$(g=9\mathrm{.}14\frac{m}{s^2}),$ the piston rests

on the stops $($indicated in black$).$ Energy is transferred to this arrangement

until there is only saturated vapor inside.

A$.$ Show this process on a $T-v$ diagram.

B$.$ What is the temperature of the $H_{2}O$ when the piston first rises from

the stops?