53. A mixture with 70% quality at 500 kPa is heated isothermally until its pressure is 300 kPa.

Find the heat added during the process.

@ 600 kPa: sf = 1.8607 kJ/kg-K sfg = 4.9606 kJ/kg-K

@ 300 kPa and 151.86°C: s = 7.0888 kJ/kg-K

A. 745.92 kJ/kg

B. 535.16 kJ/kg

C. 982.44 kJ/kg

D. 765.34 kJ/kg