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Chapter 10  Section B  NonNumerical Solutions
10.5
For a binary system, the next equation following Eq. (10.2) shows that
P
is linear in
x
1
. Thus no
maximum or minimum can exist in this relation. Since such an extremum is required for the existence
of an azeotrope, no azeotrope is possible.
10.6
(
a
) Because benzene and toluene are chemically similar and the pressure is only 1(atm), this system
can be modeled by Raoult’s law to a good approximation.
(
b
) Although
n
hexane and
n
heptane are chemically similar, a pressure of 25 bar is too high for
modeling this system by Raoult’s law.
(
c
) At 200 K, hydrogen is supercritical, and modeling the hydrogen/propane system at this tempera
ture by Raoult’s law is out of the question, because no value of
P
sat
for hydrogen is known.
(
d
) Because isooctane and
n
octane are chemically similar and at a temperature (373.15 K) close to
their normal boiling points, this system can be modeled by Raoult’s law to a good approximation.
(
e
) Water and
n
decane are much too dissimilar to be modeled by Raoult’s law, and are in fact only
slightly soluble in one another at 300 K.
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 Spring '11
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