$($a$)$ Steam at $230C$ is in two phase state with a density of $0\mathrm{.}025gc{m}^{-3}.$ Determine the quality,

enthalpy and entropy.

$(2M$

$($b$)$ Determine the BUBL point pressure $($Range $=250-350$ psia$)$ for

methane$(1)/$ethane$(2)/$propane$(3)$ system at $-40F[$Given $x_1=0\mathrm{.}20$ and $\{$:$x_2=0\mathrm{.}30].$ Also calculate

the DEW point pressure Range $=100-150a$ for the same system at $-40F[$Given $y_l=0\mathrm{.}60$

and $y_2=0\mathrm{.}30]$

$(3$ M$)$