A 1.5 kg of steam originally at a pressure of 1 MN/m² and temperature 225°C is expanded until the pressure becomes 0.28 MN/m². The dryness fraction of steam is 0.9. Determine the change in internal energy.
a) -3262.5 kJ
b) -2167.5 kJ
c) -1425.0 kJ
d) -1095.0 kJ