\sect{Baruch's  A02.}

Consider mixing of two gases with initial different
temperatures, ${T_{1}, T_{2}}$, particle numbers $N_1,N_2$ and
volumes $V_1,V_2$, respectively. Evaluate the mixing entropy (i.e.
the change of entropy upon mixing) in two cases: (i) the gases are
identical, (ii) the gases are distinct (but have equal mass).
Show that the mixing entropy in case (ii) is larger and argue for the reason.

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