Identify which of the following systems will increase, decrease,
or not change in entropy. (a) The reversible isothermal compression
of a gas at 25°C to 1/3 its volume

(b) The reversible adiabatic compression of a gas at 25°C to 1/3
its volume

(c) SO2(g) + N2O4(g)  SO3(g) + NO(g) + NO2(g)

(d) KCl(s) + H2O(l)  KCl(aq)

(e) a mixture of red, blue, and yellow marbles separated into a
pile each of red, blue, and yellow marbles

(f) a mound of snow subliming away at -10°C.