$(10$ points$)$ R$-134$a enters a throttle at $7$ bar and a quality of $0\mathrm{.}1$ and exits at $1$ bar.

$($a$)$ What is the specific volume at the inlet and at the exit?

$($b$)$ Locate and label the initial and final states on a T$-$v diagram. Draw and label the

isobars passing through the states