A closed chamber with rigid walls is partitioned in two by a membrane. One part (1) contains 1kmol argon of temperature 80C and pressure 1,2 bar, and the other part (2) contains 2kmol nitrogen (N2) of temperature 15C and pressure 2,0 bar. The chamber is well isolated, non-moving, and the (total) volume is unchanged. We neglect the volume of the membrane that partitions the chamber. The membrane is removed and the gases mix (3). a) Determine the temperature and pressure in the mixture (3). b) Determine the entropy production of the mixing process