Steam has an initial pressure of $2\mathrm{.}040$E$3$ kPa and a temp of $500$ C$.$ The steam then expands reversibly to a new pressure of $50$ kPa with a dryness fraction of $0\mathrm{.}91.$ Determine the following:

a$)$ The change in specific enthalpy $($final minus initial$)$

Number

kJ$/$kg $($if negative, enter as negative$)$

b$)$ The change in internal energy $($final minus initial$)$