CH353
- Physical Chemistry I Spring 2015, Unique 51170 Lecture Summary, 12 February 2015 |

Entropy of phase transitions:
Phase transitions are to a good approximation reversible
processes. Therefore, we can estimate the heat involved in a
phase transition, q(trans) = deltaH(trans). The
change in entropy of the system is therefore delta S(trans) = deltaH(trans)/T
Entropy of Mixing: If two gasses at the same
T and P are separated by a partition, and if that
partition is removed, the gasses will mix spontaneously. The
change in entropy of the system isdelta S(mix) = -n(2)Rln(V2/Vf)
+ -n(1)Rln(V1/Vf) |