Nitrogen at 600 kPa, 127C is in a 0.5 m3 insulated tank connected to a pipe with

Question:

Nitrogen at 600 kPa, 127C is in a 0.5 m3 insulated tank connected to a pipe with a valve to a second insulated initially empty tank of volume 0.5 m3. The valve is opened and the nitrogen fills both tanks. Find the final pressure and temperature and the entropy generation this process causes. Why is the process irreversible?