Chemical Engineering 140
August 30, 2010
Problem Set #1
Due September 11, 2013
* FR stands for Felder & Rousseau
* Parentheses denote a problem from 7th edition of text
1. 2.3.6 (1.23)
2.
3.
Misuse of significant figures in engineering is unacceptable. Do

Problem Set #2 - Solution
CBE 140
Fall 2013
Problem #7 (10 pts)
a) Yes, because when is plotted vs t in rectangular coordinates, the plot is a straight line with
slope m = -k = -9.3 x 10-3 min-1
(+2 points for correct slope value)
(+3 points for graph. No

Chemical Engineering 140
September 09, 2013
Problem Set #2
7. 2.34 FR. In addition to parts (a) and (b), please be sure to answer part (c)
below.
A chemical reaction AB is carried out in a closed vessel. The following data are
taken for the concentration

Name _
Your GSIs name _
ChE 140 2016 Quiz 2
Contacter for liquid-liquid extraction:
qaq
qorg
The following reactions occur only in the aqueous phase
(
).
!
2
+ !
!
The reactions are elementary as written.
P is our desired product and U is an undesired

1. (15 pts) Heat diffusion in time and space is sometimes described by Fouriers law applied in
this form:
dT
dt
2
d2T
dy2
= ( ddxT2 +
2
+ ddzT2 )
Where:
T [=] temperature
x, y, z [=] length
t [=] time
= the thermal diffusivity
Momentum diffusion in time

MIDTERM #2 EXAMINATION - November 2, 2016
Chemical Engineering 140
Fall 2016
Professors David Graves and Jeffrey Reimer
Your SID #: _
Your name: _
Name of the neighbor to your right: _
Name of the neighbor to your left: _
INSTRUCTIONS
Read over the whole

Chemical Engineering 140
August 31, 2015
Problem Set #2
7.
2.34 also answer part (c)
(c) What is the reaction-rate expression in a batch stirred tank reactor?
8.
Given on a previous midterm
An incompressible, nonvolatile liquid is pumped into the bottom o

A spherical metal drum is slowly filled with benzene as shown in Figure 10.
a. Derive a symbolic formula for , the density in kg/m3 of benzene-containing drum as a
function of the following:
h, the depth of benzene
R, the radius of the spherical tank
b, t

Chemical Engineering 140
September 14, 2015
Problem Set #4
16. 4.2
17. 4.6
18. 4.16
19. 4.19
20. To provide fresh water in arid areas, seawater can be desalinated by reverse
osmosis
(RO). As the population of California rises and more years of draught occ

Chemical Engineering 140
August 26, 2015
Problem Set #1
(Due Wednesday, September 2)
* stands for Himmelblau and Riggs, 8th edition. Problem numbers without an asterisk are
from Felder and Rousseau.
1. *2.3.6
The velocity in a pipe in turbulent flow is ex

Chemical Engineering 140
October 26, 2013
Problem Set #10
Due November 06, 2015
42. 6.1
43. *8.2.11
A vessel contains liquid ethanol, ethanol vapor, and nitrogen gas at equilibrium. How
many phases, components, and degrees of freedom are there according t

CBE140Scholars
Fall2016
MockExam
1.(6points)Considerthethreedifferentsituationsbelowandidentifywhichoneisatsteady
state,equilibrium,ortransient.Then,applytheconservationequationonthewaterineach
exampleandsimplifybycancelingterms.
a) Dryingwetlaundry
Trans

Problem Solutions #7
34.
35.
1
2
36.
3
4
5
6
7
8
37b on next page
9
10
Once the single pass conversion gets to about 0.2, or even 0.15, there is no improvement in
overall conversion.
11

Homework Solutions
63. 11.25 FR
1
Problem Set 13
2
64. 9.3.41. The solution below is formally correct, but not carefully derived. Start with
Integration gives
This is the basis for the solution below.
3
4
5
6
7
8
9

Units
When we have (/) (/) !"/! , the argument of a logarithm or the power
of an exponent must be unitless.
!"
!
!"
!
When we have the derivative , this has the same units as
When we have the derivative
!
! !
!
, this has the same units as !

ChE 140 Discussion 10
1. Heat transfer with mass flow - Duncan and Reimer 3.77
2. Heat transfer with mass flow - Duncan and Reimer 3.67
3. Mass transfer in an extractor
1. Heat transfer with mass flow - Duncan and Reimer 3.77
A) Calculate the flow rate of

CBE140Scholars
Fall2016
MockExam
1.(6points)Considerthethreedifferentsituationsbelowandidentifywhichoneisatsteady
state,equilibrium,ortransient.Then,applytheconservationequationonthewaterineach
exampleandsimplifybycancelingterms.
a) Dryingwetlaundry
b) A

Name: _
Last 4 Digits of Student I.D.#: _
CBE 140 Final Exam Spring Sem. 2014 Open-Book Section 250 Points (out of 300 Total)
(Textbook, notes, other references, and calculators OK, but no connected devices)
1. (20 pts. 5 pts. each) Convert the following

Name: _
Last 4 Digits of Student I.D.#: _
CBE 140 Midterm Spring Semester 2014 Open-Book Section 110 Points (out of 150 Total)
(Textbook, notes, other references, and calculators OK, but no connected devices)
1. (10 pts.) Cal CBE student Nora Lenderby goe

Name: _
Last 4 Digits of Student I.D.#: _
CBE 140 Midterm Spring Semester 2014 Closed-Book Section 40 Points (out of 150 Total)
(Circle the letter of the correct answer on multiple-choice questions)
1. (2 pts.) The SI unit for power is the watt. What is t

Chemical Engineering 140
October 05, 2015
Problem Set #7
31. 4.36
32. 4.62
33.
Also, do part c
(c) batch stirred tank reactor
Note that the kinetic rate expressions shown above are net rates of depletion, not
production.
34. Consider the example done in c

Chemical Engineering 140
November 09, 2015
Problem Set #12
Due Wednesday November 18, 2015
51.
From Midterm 3, 2004
A liquid mixture initially containing 60.0 moles of n-pentane and 40.0 moles of
n-heptane and initially at 53oC is partially vaporized at P

Chemical Engineering 140
September 28, 2015
Problem Set #6
26.
4.46
27.
4.47 In part d, consider at most two other temperatures besides 1123 K.
28.
4.49
29.
The gas stream from a sulfur burner is composed of 15-mol% SO2, 20-mol% O2, and
65-mol% N2. This g

Chemical Engineering 140
December 02, 2015
Problem Solutions #14
61.
\
See below:
+1 for initial balance on delta H (delta H = W + Q)
+1 for correct value of delta H2
+1 for correct setup for solving delta H1, +1 for the correct delta H1 value
+1 for gett