Refrigerant$-134$a is introduced into a diffuser as a saturated vapor at a pressure of $575$ kPaand a velocity of $160$ m$/$s$.$ It exits the diffuser at a pressure of $700$ kPa and a temperature of$35\backslash$deg C$.$ The refrigerant is gaining heat at a rate of $7200$ kJ$/$h as it passes through the diffuser. Ifthe exit area is $80\%$ greater than the inlet area. Determine:

a$)$the enthalpy at the diffuser inlet $($unit: kJ$/$kg$),$

b$)$the enthalpy at the diffuser exit $($unit: kJ$/$kg$)$

c$)$ the exit velocity $($unit: m$/$s$),$

d$)$ the mass flow rate of the refrigerant $($unit: kg$/$s$).$