Introduction to Environmental Engineering
EXAMl
(CE 3501)
2/17/11
Name
PART A: SHORT ANSWER, 4 points each
l.
1 ng is the same as
a. 1000 g b.
1000 mg
0.001
g
0.001 mg
0.001 g
1.
c.
d.
c.
1 Gg is the
Useful values
pKa for H2C03 = 6.3
pKa for HC03. = 10.3
pKa for NH/ = 9.3
=
Ks for CaC03
5 x l o9
Molecular weights: C
Kw= 1014
=
12, H
=
1, 0 = 16, N
= 14
Useful equations
At equilibrium for the react
Useful values
pKa for H2CO3 = 6.3
pKa for HCO3- = 10.3
pKa for NH4+ = 9.3
-9
Ks for10
K = CaCO3 = 5 10
-14
w
Molecular weights: C = 12, H = 1, O = 16, N = 14
c
d
a
b
Useful equations
At equilibrium fo
Useful values
Molecular weights: H2=2 g/mol, C=l2 g/mol, air=29 g/mol
ASSUMER= 0.1 L-atm/K-mol
ASSUME density of ethanol = 0.6 g/mL
L, for water
= 2400
k.J/kg
Mass of air in the atmosphere is 1021 gra
BACKGROUND QUIZ (9/4/12)
1.
What is pH (indicate all that are correct)?
a. the measure of the acidity of a solution
b. the measure of total dissolved ions in a solution
c. -log[H+]
d. a harmful pollut
CE 3501 Problem Set #2 Answer Key
Total Points: 100
1. Problem 1.7 in the book (15 Points Total)
Step 1: The mass balance equation upstream of take-out for drinking water:
Step 2: The mass balance for
CE 3501 Problem Set #1 Answer Key
Total Points: 100
1. Balance the following reactions (35 Points)
a.
6 COOH + 1 Cr2O72- + 8 H+ 2 Cr3+ + 6 CO2 + 7 H2O
b.
6 O2 + 1 C6H12O6 6 CO2 + 6 H2O
c.
1 C6H5OH + 1