An insulated rigid tank contains two chambers, each with a volume of 0.25 m³. Air at 300 kPa and 25° C is contained in one chamber of the insulated tank. The air is suddenly expanded to twice its volume when the wall dividing the two chambers is punctured.

A. Determine the final temperature and pressure of the air.

B. Determine the change in entropy of the air during the process.

C. Why does the entropy increase in this process?