Phase Diagrams and the Relative Stability of Solids,
Liquids, and Gases
Substances are found in solid, liquid, and gaseous phases.
Phase refers to a form of matter that is uniform with respect to chemical composition
and the state of aggregation on both
Physical Chemistry II
Chapter 8 (4, 6, 11, 23, 28, 34, 39)
P8.4) Use the vapor pressures for PbS given in the following table to estimate the temperature
and pressure of the triple point and also the enthalpies of fusion, vaporization
The quantity of energy that flows across the boundary between the system and
surroundings because of the temperature difference.
Like work, heat has several important characteristic:
Heat is transitory.
The net effect of heat is to change the inter
CHM 346 Physical Chemistry II, Spring 2008
Problem Set 9 Solutions
Problems from Chapters 7 and 8 of Engel and Reid:
P7.1) A sample containing 35.0 g of Ar is enclosed in a container of volume 0.165 L at
390 K. Calculate P using the ideal gas, van der Waa
Thermodynamics is the branch of science that describes the behavior of matter and
the transformation between different forms of energy on a macroscopic scale.
For example: Water can be described by two or three macroscopic variables
The Change of Entropy in the Surroundings and
Stotal = S + Ssurroundings
As shown in the previous section, the entropy of an isolated system increases in a
Is it always true that a process is spontaneous if S for the system is posit