PROBLEM $6\mathrm{.}8$

Water contained in a closed, rigid tank, initially at

$100t\frac{b}{i}n.{?}^2,800F,$ is cooled to o final state where the pressure

is $20lb\frac{f}{i}{n}^2$ Determine the, change in specific entropy, in

Btull$6-R,$ and show the process on sketches of the $T-v$ and

T$-$s diagrams.