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ChE 330
Exam 2:
Winter 2002
Open Book
Course Notes, Homework Solutions, and Course Text Only!
There are 9 pages including the cover for this exam
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1.
Short Answers
(25 pts)
a) (5 pts) Where is the fugacity larger point A or point B? Why?
(This plot shows an isotherm. On that isotherm
P
sat
r
= 0
.
7)
012345
0.4
0.5
0.6
0.7
0.8
0.9
1
P_r
V_r
A
B
Psat
At point A, at
P
sat
the fugacities are equal. A is higher that
f
sat
and and B is lower than
f
sat
. Fugacity always increases with pressure. See
f
versus
P
plot on Chapter 8 review sheet.
Grading: +3 for right answer wrong reason
b) (5 pts) I demand an
HP
plot of Freon11. Does your textbook have enough informa
tion in its tables for you to generate one? If yes, explain what information you would use.
If no, explain what extra information you need.
Yes, To use a Cubic equation of state and departure functions I need critical parameters
acentric factor and ideal gas heat capacity. They are all in the book.
This is direclty from PS 5, make an HP chart.
Grading: +2 for critical temp and pressure, +1 for
ω
, +2 for
C
ig
p
Initials:
3
c) (5 pts) How would you use the matlab function
PhiHat
PengRobinson
to check if a
mixture were an Ideal Solution?
(
PhiHat
PengRobinson
returns the value of
ˆ
φ
i
(
T, P, z
)
for each component in a mixture).
In an ideal solution
ˆ
f
is
i
=
y
i
f
i
f
i
=
φ
i
P
ˆ
f
is
i
=
y
i
φ
i
P
In any mixture
ˆ
f
is
i
=
y
i
ˆ
φ
i
P
So a material is an ideal solution if
φ
i
=
ˆ
φ
i
I can get
φ
i
by
PhiHat
PengRobinson
for a pure component.
This was on old exam.
Grading +3 for
φ
i
=
ˆ
φ
i
, +1 for a method to calculate
φ
i
, +2 for using
PhiHat
PengRobinson
on
z
1
= 1
, z
2
= 0
to get
φ
1
d) (5 pts) A glass of wine is in this room where the total pressure is 1 atmosphere
and the temperature is 25C. The bubble pressure calculation for the liquid composition of
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This note was uploaded on 04/21/2008 for the course CHE 330 taught by Professor N/a during the Winter '02 term at University of Michigan.
 Winter '02
 N/A

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