Molar Heat Capacities: an Expansion Process on an Ideal Diatomic

Molar heat capacities: An expansion process on an ideal diatomic gas has a linear path between the initial and final states on a pV diagram. The initial pressure is the initial volume is and the initial temperature is The final pressure is and the final temperature is The change in the internal (thermal) energy of the gas is closest to

A) -3100 J.
B) -1800 J.
C) 3100 J.
D) 1800 J.
E) 0.00 J.