$(20$ points, no requirement for standard solving format$)$ Determine the phase or

phases in a system consisting of $H_{2}O$ at the following conditions and sketch $p-v$ and

$T-v$ diagrams showing the location of each state.

a$)p=10$ bar, $T=179\mathrm{.}9C.$

b$)p=10$ bar, $T=150C.$

c$)T=100C,p=0\mathrm{.}5$ bar.

d$)T=20C,p=\frac{50}{b}ar.$