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
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

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

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

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
November 11, 2013
Problem Set #11
Due Friday, November 13, 2015
47. 9.1 Denn
d
e
48. Solve parts c, and d above but using Aspen.
49. Denn
1
50. In class, the following relation was derived for counter-current extraction starting w

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
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

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
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

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

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 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

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 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

Chemical Engineering 140
November 11, 2013
Problem Set #11
Due Friday, November 13, 2015
47. 9.1 Denn
d
e
48. Solve parts c, and d above but using Aspen.
49. Denn
1
50. In class, the following relation was derived for counter-current extraction starting w

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
October 14, 2015
HW # 7 Solutions
31.
.
1
2
32.
3
4
35 cont
33.
Students may also write the CSTR equations in terms of
V and Q instead of Tau. Tau=V/Q
Regardless of the reactor, students may also write:
r A =2 k 1 C 2 +2 k 2 C R k

Problem Set #4 Solutions
15. (20 points total)
1
19. (8 points total)
+1
+2 for correct DOF
analysis
+1 for each equation
(5 total)
20.
2
+1 for work
+1 for correct answer
+1 for DOF analysis
+2 for drawing diagram
+2 for correctly labeling
each stream
+1

Chemical Engineering 140
September 30, 2015
HW # 6 Solutions
26.
+1 for showing
some work
+1 for correct
equilibrium extent
of reaction
+1 for correct fractional
conversion
+1 for correct methanol
feed
1
+2 for correct mole
fractions (sig figs not
importa

HW2
7. From Felder and Rousseau
(This is plotted on rectangular coordinates)
(This is a semilog plot)
2.34 (b)
Given that V = 30.5 gal, first calculate CA at 120 min, then performing mass balance to find the weight
of B produced.
C e
C
l A A C Ae A Ck t

Homework Set #1 Solutions
2. 1.24 From Himmelblau (9 points total)
The left hand side has units of 1/length and x/a is dimensionless so that the third answer is correct.
Explanation:
x
2
dx
(a)
a2
x has a unit of length, a, a constant should carry the un

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

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: Chemical Process Analysis
Fall 20 1 6
Homework Assignment 1 (100 pts)
Due Wednesday August 31St at 12:00 pm (noon) on Gradescope
1. (Duncan and Reimer Problem 5.4)
Condensation is an important phenomenon in liquid-vapor separations. In a common
a