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CEE 320: Environmental Engineering
Midterm Exam (alternate)
10 March 2009
NAME
GROUND RULES:
This is a closedbook/closednote exam, except that you are permitted one
sheet of notes.
Do your work on the paper provided.
After the exam, staple your work to this exam
sheet.
Please be sure that your name is written on each page you submit.
Also, please be sure that
the problem number and your answer are clearly indicated.
The total score possible is 100 points, and the time allowed is 180 minutes (3 hr).
Use the time
wisely.
Good luck!
REMINDER:
Read the questions carefully, and be certain you are responding appropriately.
HINTS:
(1)
If you don’t understand a question, you may ask for clarification.
(2)
If you seem to be missing an important piece of information, assume a reasonable value,
state your assumption, and proceed.
(3)
Partial credit is granted, but only if your work can be understood (and your thinking is
reasonable).
(4)
See below for potentially relevant data.
PROBLEM #1 (23 possible)
_________
PROBLEM #2 (22 possible)
_________
PROBLEM #3 (30 possible)
_________
PROBLEM #4 (10 possible)
_________
PROBLEM #5 (10 possible)
_________
PROBLEM #5 (5 possible)
_________
TOTAL SCORE (out of 100)
DATA
(some of which may be useful)
Molecular weights (g mole
1
):
H – 1, C – 12, N – 14, O – 16, Hg– 200.6, Cr – 52
Approximate composition of dry atmosphere:
N
2
– 79%, O
2
– 21%
Ideal gas law:
PV = nRT
Gas constant:
R = 82.05 x 10
6
atm m
3
mole
1
K
1
Conversion factors:
Pressure:
1 atm = 1.01325 x 10
5
Pa
Volume: 1 m
3
= 1000 L
1 L = 1000 cm
3
Temperature: T (K) = T(
o
C) + 273
Definitions:
pH = log
10
([H
+
])
pK
A
= log
10
([K
A
])
pK
sp
= log
10
([K
sp
])
Acid dissociation equilibrium:
HA
⇔
H
+
+ A

K
A
= [H
+
][A

]/[HA]
Dissociation of water:
H
2
O
⇔
H
+
+ OH

K
w
= [H
+
][OH

] = 10
14
M
2
Standard oxidation states of elements in compounds:
X
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 Spring '10
 MCMAHON

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