$6\mathrm{.}37.$ Steam undergoes a change from an initial state of $450C$ and $3000$kPa to a final state of $140C$ and $235$kPa. Determine $H$ and $S$ :

$($e$)$ From steam$-$table data.

$($b$)$ By equations for an ideal gas.

$($c$)$ By appropriate generalized correlations.