Problem $1$

Using the appropriate tables, determine the change in specific entropy between the specified states, in $Bt\frac{u}{l}bR.$ Show the states on a sketch of the T$-$s diagram.

$($a$)$ water, $P_1=10lb\frac{f}{i}{n}^2,$ saturated vapor; $P_2=500lb\frac{f}{i}n\mathrm{.}2,T_2=800F.$

$($b$)$ ammonia, $P_1=140lb\frac{f}{i}{n}^2,T_1=180F$;$T_2=-10F,h_2=590Bt\frac{u}{l}b.$

$($c$)$ air as an ideal gas, $T_1=80F,P_1=1$atm;$T_2=340F,p=5$atm.

$($d$)$oxygen as an ideal gas, $T_1=T_2=520R,P_1=10$atm,$P_2=5$atm.