CHEM2002 Workshop 1
Some Extra Problems
6. The transmittance of a 0.01 M solution of Br2 in CCl4 with a path
length of 2 mm is 28%. Calculate the molar absorption coefficient at
that wavelength. What would be the %T of the same solution in a cell
1 cm thi
Solutions to CHEM2002 Practice Problems Week 5
Problem 1
A reaction has the rate law: R = k [A]2 [B][C]. What are the units of the rate constant, k?
Answer: mol3L3s1
Problem 2
One of the hazards of nuclear explosions is the generation of 90Sr and its su
The equilibrium constant
k1
CHEM2002
Chemical Kinetics L5 + L6
Solutions to problems
A+B
P
k1
s1)
K
(M1)
103
106
103
103
1
103
103
1
103
(M1
The forward reaction is
controlling the position of the
equilibrium true/false?
The rate of the reaction ca
CHEMZOOZ Practice Problems Week 7
Problem 1
Mixing two metal ions Cu2+ and Nip, with a ligand (L) in the ratio 1:1:1 results in formation
of both Cu2+ and Ni2+ complexes in the ratio of CuLZ+2NiL2+ = 1:5. Using the following
information; Km = 2.5><105
Name:
Student No.:
CHEM2002 Tutorial Problem Week 13
2013
Thermodynamics and Equilibria
1.
Ethylene glycol (or ethane1,2diol, C2H6O2) has low volatility, is miscible with water, and
is used as an antifreeze agent. What mass of ethylene glycol is re
CHEM2002 Tutorial Problems Week 9
Thermodynamics and Equilibria
1.
Nitrogen gas is maintained at 152 kPa in a 2.00 dm3 vessel at 298.15 K. If its molar
mass is 28.0134 g mol1 calculate:
a)
b)
c)
d)
e)
2.
The amount of N2 present
The number of molecules p
CHEM2002 Tutorial Problem Set Week 11
Thermodynamics and Equilibria
1
The equilibrium constant KP for the reaction
I2 (g) + cyclopentene(g) 2HI(g) + cyclopentadiene(g)
varies with temperature according to the equation
ln K P = 17.39 11156 /(T / K ) with s
CHEM2002 Tutorial Problem Set Week 10
Thermodynamics and Equilibria
1.
When 0.633 g of benzene are burnt in a bomb calorimeter at 25oC, 26.54 kJ of heat is
evolved.
(i)
Calculate U for combustion of one mole of benzene
(ii)
Calculate H for combustion of o
CHEM2002 Tutorial Problem Set Week 12
Thermodynamics and Equilibria
1.
The equilibrium constant KP for the reaction
I2 (g) + cyclopentene(g) 2HI(g) + cyclopentadiene(g)
KP = 2.256 at 400C.
Calculate Kc and G0 (standard state: 1 M) at 400C.
2.
2.00 mol of
CHEM2002 Tutorial Problem Set Week 10
Thermodynamics and Equilibria Worked Solutions
1.
When 0.633 g of benzene are burnt in a bomb calorimeter at 25oC, 26.54 kJ of heat is
evolved.
(i)
(ii)
Calculate U for combustion of one mole of benzene
Calculate H fo
CHEM2002 Tutorial Problem Set Week 11
Thermodynamics and Equilibria
1
The equilibrium constant KP for the reaction
I2 (g) + cyclopentene(g) 2HI(g) + cyclopentadiene(g)
varies with temperature according to the equation
ln K P = 17.39 11156 /(T / K ) with s
Zero order
[S]
0.045
0.042
0.039
0.036
Q: What is the order
of this reaction?
R2: 0.98138
0.018
0.015
CHEM2002
Chemical Kinetics L3 + L4
0
200
400
Time (s)
600
800
1st order
First order
3.1
3.2
3.3
3.4
ln[S]
Solutions to problems
0.033
0.03
0.027
0.02
CHEM2002 Practice Problems Week 8
Problem 1
The reaction of a compound, A, is inhibited when it is in its protonated form (pKa = 5):
The reaction was followed at pH 4 and the observed rate constant found to be kobs = 9.09108
s1. Find the rate constant,
CHEM2002 Workshop 2
Some Extra Problems
6. The CO molecule has a fundamental vibration (v=0v=1) at 2143.3
cm1 and the first overtone transition (v=0v=2) at 4259.7 cm1.
(a) Calculate the vibrational constants and e for CO.
(b) Predict the wavenumber of t
Worked Solutions to Workshop 1
1. The molar absorption coefficient of human hemoglobin is = 532
mol1 l cm1 at 430 nm. A solution of hemoglobin in a cuvette with a path
length of 1 cm was found to have a transmittance of 76.7% at =430nm.
What is the conc
Solutions to Vibrational Spectroscopy Problems
1. Analysis of a rovibrational spectrum of the H35Cl molecule shows that
its fundamental vibrational frequency, , is at 2988.9 cm1. Calculate the
force constant of the HCl bond. (Hint: Watch your units, 1
CHEM2002 Tutorial 3 Electronic Spectra: The hydrogen spectrum
Worked Solutions:
1. What are the wavelengths of the missing members of the Lyman and Balmer
series, given as ? in Table 1.
n
Name
1
2
3
4
5
n =2
Lyman 122
Balmer Paschen Brackett Pfund

wavel
CHEM
M2002 Tu
utorial 3
Electr
ronic Spec
ctra: The hydroge spectru
e
en
um
If you look at th spectrum of a hyd
he
m
drogen lam you wi see an e
mp
ill
emission
spectru where the light i in very sharp line at precis wavelengths:
um
is
es
se
he
m
un,
will
h
Reversible Reactions
CHEM2002
Chemical Kinetics
Sections: 35.10; 36.4 (not subsections)
A/Prof Lisbeth Grndahl
School of Chemistry and Molecular Biosciences
University of Queensland
l.grondahl@uq.edu.au
Chemistry building
Ph 3365 3671
L1L4
Reactions ass
CHEM2002 Practice Problems Week 7
Problem 3 with answers
A polymerisation reaction of vinyl acetate (CH2=CHOC(O)CH3) was conducted using an
initial monomer concentration of 2.5 M, an initiator with an efficiency factor of 0.73 and an
initial concentratio
Name:_ Student Number:_
CHEM2002 Kinetics
Tutorial week 8  2013
Two consecutive reactions occur according to the reaction scheme:
A
k1
I
k2
P
Below is the concentration versus time profile for such a reaction that involves the
following chemical species:
Name:_ Student Number:_
CHEM2002 Kinetics
Tutorial 2  2013
1.
The reaction between bromate ions and bromide ions in acidic solution is given by the
equation:
BrO3(aq) + 5Br(aq) + 6H+(aq) 3Br2(l) + 3H2O(l)
The following initial rates data were obtained.
Quiz
Q1
Q2
CHEM2002
Chemical Kinetics L1 + L2
Solutions to problems
Does the rate of reaction depend on the concentration of the
starting material? Depends on the order. If zero order then no,
in all other cases then yes.
Can you find the rate law from th
Solutions CHEM2002 Practice Problems Week 6
Problem 1
Some results for the rate of a reaction between two substances A and B are shown here.
Deduct the order m with respect to A, the order n with respect to B, and the rate constant.
[A]/M
1.4 x 102
2.8 x
CHEM2002 Tutorial Problem Set Week 12
Thermodynamics and Equilibria
1.
The equilibrium constant KP for the reaction
I2 (g) + cyclopentene(g) 2HI(g) + cyclopentadiene(g)
KP = 2.256 at 400C.
Calculate Kc and G0 (standard state: 1 M) at 400C.
400C = 673 K.
S