potential or molar free
energy determines when a substance will move from one
chemical region to another, it often is referred to as an
When I2 is concentrated
in the ether layer, it has a high free energy per mole,
or a high escaping tendency.
If the escaping tendency of I2 in water is lower
because the concentration there is low, then iodine will diffuse
from ether to water until its escaping
tendencies in the two phases are the same.
This relationship between free energy and escaping tendency
is especially helpful in understanding some of the properties
of solutions, and these are the subject of the first part
of this chapter.
lodine molecules will partition
themselves between the ether and water layers until their
molar free energy, or escaping tendency, is the same in each