A 12.0L gas tank containing 3.40 moles of ideal He gas at 30.0C is placed inside a completely evacuated insulated bell jar of volume 37.0L. A small hole in the tank allows the He to leak out into the jar until the gas reaches a final equilibrium state with no more leakage.
1. Is the process reversible or irreversible?
2. What is the change in entropy of this system due to the leaking of the gas?