Problem S2.2. An insulated box is partitioned into two compartments, each containing an ideal gas of different molecular species. Assume that each compartment has the same temperature but different number of moles, different pressure, and different volume [the thermodynamic variables of the ith box are (Pi, T, ni, V.)]. The partition is suddenly removed and the system is allowed to reach equilibrium.

(a) What are the final temperature and pressure?

(b) What is the change in the entropy?