ECH 152B, Winter 2015, Roland Faller
Solutions for Homework 2, January 23, 2015
Number 1
Show that in a binary solution we can write the partial molar properties M i of
any property M as
M 1 = M + x2 dx1 M
M 2 = M x1 dx1 M
Solution We know that
M = x1 M 1

ECH 152B, Winter 2016, Adam Moule & Roland Faller
Solutions for Homework 2, January 23, 2016
Number 1
Show that in a binary solution we can write the partial molar properties M i of
any property M as
M 1 = M + x2 dx1 M
M 2 = M x1 dx1 M
Solution We know th

Winter 2010 University of California at Davis Department of Chemical Engineering and Materials Science
ECH 141
HW # 7
#1) (20 points) Consider steady flow in a horizontal pipe. Use dimensional analysis to generate a non-dimensional relationship for shear

ECH 152B, Winter 2015, Roland Faller
Solution for Homework 1, January 16, 2015
Problem 1. Assume a benzenetoluene mixture obeys Raoults law. Calculate
(a) yB and P if xB = 0.6 and T = 412K
(b) xT and T if yB = 0.6 and p = 120kP a
y is the (molar) concentr

ECH 152B, Winter 2014, Roland Faller and Adam Moul
e
Solutions for ReviewHomework 4, January 27, 2016
Problem 1 We do a ash calculation of the following mixture: 55% (by mole)
pentane, 25 % hexane and 20 % heptane. The vapor pressures are 2750 kpa
(pentan

ECH 152B, Winter 2015, Roland Faller
Solutions for Midterm 2, March 4, 2015
28 points total.
1. (6 = 3 + 3 points)
(a) Determine the number of independent reactions if the system contains H2 O,
H2 CO3 , and CO2 . Give one possible set of reactions.
(b) Wr

ECH 152B, Winter 2016, Roland Faller and Adam Moul
e
Midterm Exam 1, January 26, 2016
No Book, No Notes, Maximum: 26 points.
1. (8 = 4 2 points)
(a) What is an ideal mixture?
(b) Sketch a simple T xy diagram in a liquidgas binary system (i.e. without
azeo

ECH 152B, Winter 2016, Roland Faller and Adam Moul
e
Solutions for Homework 3, January 23, 2016
Problem 1 What is the pressure of the system and the molar fraction of
n-hexane (C6 H14 ) in the ideal gas vapor above an ideal solution of 80 g of
nhexane and

ECH 152B, Winter 2014, Roland Faller
Solutions for ReviewHomework 4, February 29, 2015
Problem 1
1. Assume in a ternary system that the enthalpy can be described by
1000x1 + 800x2 + 1400x3 + 11x1 x2 + 334x2 x3 .
H
kJ/mol
=
(a) Calculate the partial molar

ECH 152B, Winter 2015, Roland Faller
Solution for Homework 7, February 28, 2015
Problem 1 Show that the modied Wilson equation
GE
= C[x1 ln(x1 + x2 12 ) + x2 ln(x2 + x1 21 )]
RT
can describe liquidliquid equilibrium (C, ij being constants). Determine what

ECH 152B, Winter 2015, Roland Faller
Homework 3, January 21, 2015
Due: January 28, 2015, Beginning of Lecture
1. (8 points, old midterm problem)
(a) What is the pressure of the system and the molar fraction of n-hexane
(C6 H14 ) in the ideal gas vapor abo

ECH 152B, Winter 2015, Roland Faller
Solutions for Homework 10 Test-Final, March 16, 2015
Problem 1 Draw a phase diagram (p, x) for liquidliquidvapor equilibrium
(binary mixture) where the gases are ideally miscible and the liquids are partially
immiscibl

ECH 152B, Winter 2014, Roland Faller
Homework 2, January 15, 2014
Due: January 22, Beginning of Lecture
1. (4 points) Show that in a binary solution we can write the partial molar
properties M i of any property M as
M 1 = M + x2 dx1 M
M 2 = M x1 dx1 M
2.

ECH 152B, Winter 2015, Roland Faller
Midterm Exam 1, January 30, 2015
No Book, No Notes, Maximum: 26 points.
1. (8 = 4 2 points)
(a) What is an ideal solution?
(b) Sketch a simple p xy diagram in a liquidgas binary system (i.e. without
azeotropes or criti

ECH 152B, Winter 2015, Roland Faller
Solutions for Homework 9, March 16, 2015
Problem 1
Chain length determination by osmometry
Assume you have two identical vessels of water (10 l in each) connected by a
semipermeable membrane (waterpermeable, polymerimp

ECH 152B, Winter 2015, Roland Faller
Homework 5, February 4, 2015
Due: February 11, Beginning of Lecture
1. (6 points)
E
(a) Show that the two parameter Margules equation x1 G2 RT = (A21 x1 + A12 x2 )
x
can have extrema for the activities of the constitue

Winter 2010 University of California at Davis Department of Chemical Engineering and Materials Science ECH 141 EXAMPLE MIDTERM (given in 2007)
#1) (20 points) A two-dimensional flow field is given by v= (0.5 + 0.8x) i + (1.5 0.8y) j (m/s). a) Determine if

ECH 152B, Winter 2015, Roland Faller
Solutions for Homework 3, January 28, 2015
Problem 1 What is the pressure of the system and the molar fraction of
n-hexane (C6 H14 ) in the ideal gas vapor above an ideal solution of 80 g of
nhexane and 40 g of nheptan

Reactions
(and simple Reactors)
ASPENPLUS Calculations
ECH 152B Discussion
February 6, 2015
R. Faller 2013-2015, all rights reserved
Basics of Reactions
Basics of Reactions
Basics of Reactions
Basics of Reactions
The chemical potential depends on all
con

Thermodynamic
Considerations
of a Rocket Launch
ECH 152b Discussion
February 13, 2015
The Titan IV rocket
44 m tall
3 m diameter
Cost per launch
432 million $ (in 1994)
wikipedia.org
3 Stage system Why multiple stages?
The last Titan IV Rocket Launch
Vand

Liquid-Liquid Equilibria with
some ASPENPLUS
Calculations
ECH 152B Discussion
February 20, 2015
T
Gibbs free energy and LLE
DG
One (Liquid)
Phase
Region
Upper
System
Freezes
Phase
coexistence
(bimodal)
intersects
freezing
Critical
Two
Phase
Solution
Tempe

Properties of Pure Systems:
Theory and
ASPENPLUS Calculations
ECH 152B Discussion
January 23, 2015
Basics of Pure Systems
(Reminder)
1st law:
dU = dQ + dW
Reversible: dU = TdS - pdV (+dN)
These are ALL state functions -> always
true.
NVS are natural/canon

Flash Calculations and
Gibbs Free Energies of Mixing
using
ASPENPLUS 8.x
ECH 152B Discussion
January 16, 2015
(screenshots use Aspen
8.0 or Aspen 8.4)
Announcements!
The Student Disability Center asks that students interested in serving
as paid notetaker

Qualitative Behavior of VaporLiquid Equilibria and Simple
Calculations using
ASPENPLUS V8.x
ECH 152B Discussion
January 12, 2015
Two Species
Typical Examples: Salt in Water, heptane and octane (gasoline),
ethanol in water (wine, beer etc)
Phase Rule with

ECH 152B, Winter 2016, Adam Moule & Roland Faller
Solutions for Homework 2, January 23, 2016
Number 1
Show that in a binary solution we can write the partial molar properties M i of
any property M as
ar stu
ed d
vi y re
aC s
o
ou urc
rs e
eH w
er as
o.
co

ECH 152B, Winter 2015, Roland Faller
Solutions for Homework 10 Test-Final, March 16, 2015
sh is
ar stu
ed d
vi y re
aC s
o
ou urc
rs e
eH w
er as
o.
co
m
Problem 1 Draw a phase diagram (p, x) for liquidliquidvapor equilibrium
(binary mixture) where the ga

ECH 152B, Winter 2017, Roland Faller
Solution for Homework 10, March 15, 2017
Problem 1
(a) We do a flash calculation of the following mixture: 33% (by mole) acetone,
33% hexane, and 34% water. The vapor pressures are 30.6 kPa, 20.2 kPa, and
3.17 kPa and

ECH 152B, Winter 2017, Roland Faller
Solution for Homework Aspen 1, January 27, 2017
Due: February 10, Beginning of Discussion (or upload on Canvas as a single
File, PDF preferred)
1. (15 = 5+5+5 points) Assume a mixture of (overall) 5 mol% ethane, 5 mol%

ECH 152B, Winter 2014, Roland Faller
Solution for Homework Aspen 3, March 16, 2014
1.
(a) Calculate the concentrations of naphtalene and carbon dioxide in the presence of solid carbon dioxide at 353 K and 30.4 Mpa. l12 = 0.088. Apply the
Soave/Redlich/Kwo

ECH 152B, Winter 2014, Roland Faller
Solution for Homework Aspen 2, March 10, 2014
Problem 1 Assume a 1:1 (by mol) mixture of CO and H2 O reacts at 2600 K
and 304 kPa to form CO2 and hydrogen.
(a) Determine the equilibrium concentrations analytically. You

ECH 152B, Winter 2016, Roland Faller and Adam Moule
Solutions for Homework 3, January 23, 2016
ar stu
ed d
vi y re
aC s
o
ou urc
rs e
eH w
er as
o.
co
m
Problem 1 What is the pressure of the system and the molar fraction of
n-hexane (C6 H14 ) in the ideal

ECH 152B, Winter 2017, Roland Faller
Midterm 2, February 24, 2017
1. (8 = 4 2 points) Answer the following questions:
(a) How can pressure influence a chemical reaction equilibrium if = 0?
(b) Define extent of reaction.
(c) What is the equilibrium criteri

ECH 152B, Winter 2015, Roland Faller
Solution for Homework 1, January 16, 2015
Problem 1. Assume a benzenetoluene mixture obeys Raoults law. Calculate
(a) yB and P if xB = 0.6 and T = 412K
sh is
ar stu
ed d
vi y re
aC s
o
ou urc
rs e
eH w
er as
o.
co
m
(b

ECH 152B, Winter 2017, Roland Faller
Solution for Homework 10, March 15, 2017
Problem 1
(a) We do a flash calculation of the following mixture: 33% (by mole) acetone,
33% hexane, and 34% water. The vapor pressures are 30.6 kPa, 20.2 kPa, and
3.17 kPa and

ECH 152B, Winter 2017, Roland Faller
Homework 4, January 30, 2016
This is a voluntary review homework for Midterm 1 consisting of old midterm
problems. It will not be graded. Solutions will be available online by February
1. The next homework to be graded