A fluid flowing along a pipe line undergoes a throttling process from 10 bar to 1 bar in passing through a partially open valve. Before throttling, the specific volume of the fluid is 0.5 m3/kg and after throttling is 2.0 m3/kg. What is the change in specific internal energy during the throttling process?
a. Zero b. 100 kJ/kg
c. 200 kJ/kg d. 300 kJ/kg