Steam undergoes a change from an initial state of and $\{475oC,3,400$kPa$)$ to a final state of

$(150$oC and $275$kPa $).$ Determine $H$ and $S$

$($a$)$ From steam table data.

$($b$)$ By equations for an ideal gas $($Hints: Assuming ideal gas, $($:$Cp$:${)}_H$ and $($:$Cp$:${)}_s$ can be determined

from the values of $H$ and $S$ obtained in $($a$)).$