Known Typos and Errors in Chem 106 Text
Spring 2004, first printing of Chemistry: The Science in
Context
Compiled by Drs. Gutow, Matsuno, Berge and
Mihalick with the help of
Fall 2004 and Spring 2005 Chemistry 106
students.
Periodic
Table:
The atomic mass of Tellurium (#52) should be
127.60
Chapter 11:
Page
529. Incorrect: (1419 mol)(75.3J/mol C)(-25 ˚C) = -2.67 x
107
J. Correct: (1419 mol)(75.3 J/mol C)(-25
˚C) = -2.67 x 106
J.
Page 529, bottom.
Incorrect: 2.69 x 104 kJ = (x) (6.31
kJ/mol). Correct:
2.69 x 103 kJ = (x)(6.31 kJ/mol).
Page 530, top.
Incorrect:4.26 x 103. Correct: 4.26 x
102.
Incorrect: 75 pounds -> Correct: 16.9
pounds.
Problem 63 a. Incorrect: 2 N2
-> Correct: 1 N2.
Answer to
problem 65 is 1066.5 kJ/mol.
Answer to problem 77 is 5128
kJ/mol.
Answer to problem 79 is 23.29
°C.
Problem 89: the enthalpy of formation of
decane is negative, not
positive.
Answer for Problem 99:
octane is not in the problem. Hexane has
an energy density of
32,000 kJ/L.
Chapter
12:
Concept Tests:
There is no Concept test
on p. 562.
The Concept test on p.563 is listed as 564b in back of
text.
The Concept test on p. 568 is listed as 569 in back of
text.
The answer to the Concept test on p. 575 is: both
ethane and
ethanol have London dispersion forces, but ethanol also
has
dipole-dipole and hydrogen bonding interactions, making the
molecules
stick together more.
Chapter Review (Page
601). Section 12.9 is part of section
12.6. Section 12.10
is actually 12.9. Section 12.11 is
actually 12.10.
End
of Chapter problems:
3. Answer
should be sp3.
4. "cyclichexane" is
misspelled, should be "cyclohexane"
15. n-pentane is
missing from the answers.
17. Answer should be
a, c, & d (c & d are the same).
21 The
answers show line structures, not Lewis structures, and
most of them
are wrong.
a. Answer has 1 carbon too many in the chain (it shows
2-methylhexane).
b. Move one of the methyl substituents
from the 2nd to the 3rd
carbon in the chain (it shows
2,2-dimethylhexane).
c. Remove a carbon from the chain and
move one of the methyl
substituents from the 2nd to the 3rd carbon in
the chain (it shows 2,
2-dimethylpentane).
41.
No answer given in back of text.
45. No answer
given in back of text.
53. d is pentanal, not an
isomer of it.
55. a & b are not
structural isomers; they have
different numbers of hydrogen atoms
(C5H10O vs
C5H8O).
Chapter 13:
Page 613. In
sample exercise 13.1 q = -573 J not -264
J. This results
in ∆Hsoln= 57.3 kJ/mol.
Answer to Practice
Problem 13.1 (page A-52). The correct
answer is 20.66 degrees
Celcius not 71 degrees.
end of chapter problems: they
tend to compare absolute values (a
very negative value is greater
than a slightly negative value!)
6. greater = more negative
than
7. less = less negative than
37. -175.8
J/K
Chapter 14:
Practice exercise 14.2:
H2O forms at 1.5 M/s, N2
at 0.75
M/s
Figure 14.5 colors are reversed from
caption
page 681, equation at bottom of page:
[O2] = 0.01 not
0.1
Sample exercise 14.5
solution: third line should read "as great
as experiment 2 as in
experiment
3."
Table 14.4, p. 685: First value under "ln
[O3] should
be -9.210.
End of Chapter
problems:
answer to 14.5 (c) replace delta
[NO2-] with - delta
[NH3].
answer to 14.7 (c) also equal to - 2
delta
[H2O]/delta
t
answer to 14.11 (c)
There should be minus signs in front of the
fractions on both sides
of the equal sign.
answer to 14.53 (b) 5 half
lives.
answer to 14.59: According to the kinetics
results, changing H2
to Cl2 must change the mechanism greatly.
H2 bonds are much stronger than Cl2 bonds so most chemists would
not be
surprised that they have a different reaction mechanism.
answer to 14.81: A = 6.03x1020
M-1 s-1(changed
to normal units from
cm3/molecule), Ea = 17.13 kJ/mol
answer to 14.83:
a) Ea = 314 kJ/mol
answer to 14.85: A =
1.27x1012, Ea = 39.06 kJ/mol
Chapter
15
End of Chapter problems:
answer to 5: molar
mass of 44 should have been 45 g/mol.
49a is 5.075
kJ/mol.
The answer to 49b is listed as answer to 51b.
The
answer to 51 is 1.29 x 1018.
56: The value
of the equilibrium constant does not change with
pressure.
The answer to 63 is listed as answer to 61.
The answer
to 61 is a. shift toward products; b. shift toward
reactants; c.
shift toward reactants
Chapter 16
End of Chapter
problems:
37. [OH-] = 6.0x10-4
M
69. pH = 9.51
77. pH = 4.44 at
25°C, 4.49 at 0°C
79. The Ka given in the
problem is not correct; it should be
2.2x10-13 (as in
Appendix 5).
The Henderson-Hasselbach equation predicts a pH of
12.66, but that
neglects another reaction that is also occurring in
the solution:
H2O + HPO42-
<--> OH-
+
H2PO4- Kb =
1.6x10-7
>> Ka
You can't easily set up an
equilibrium table for polyprotic acids so
don't expect any problems
like that on quizzes or exams.
81.
6.6x10-2
95. at equivalence point, pH =
8.35
Chapter
5.5
End of chapter problems:
97.c. The half reaction
is not balanced. The products should have
3
Fe2O3.
101.a. The answer should have
Mn2+ in the reactants.
Chapter 17
End of chapter
problems:
5. The reaction will not work as a battery
(the cell potential is
negative).
11.a. Cl is reduced
and Br is oxidized.
31. The half reactions are not
included in the table in the
appendix.
35.a. NiOOH(s)
+ TiZr2H(s) ->
Ni(OH)2(s)
+ TiZr2(s)
47. E = 1.54
V
51. The half reactions are not included in the table
in the
appendix.
63. At the potential required for
this electrolysis, the Cl-
could be OXIDIZED to
Cl2.
Chapter 18
polymers section:
65. Monomers a and b
could produce isotactic polymers.
69. The second
carbon in vinylalcohol is missing its H
atom.
Methyl
methacrylate should have two hydrogen substituents on one C of
the
double bond; the methyl and -COOCH3 substituents should be on
the
other C of the double bond.
71. The structure
for
polybutadiene is shown. The structure for the addition
polymer
formed from vinyl acetate is: 
metals section:
9. This problem is totally
messed up, so don't
even try it.
13. (a) -114.4 kJ/mol ore; (b)
-149.9 kJ/mol
ore; (c) - 814.2 kJ/mol ore
27. (b)
6.56x105 L
ceramics section:
30. Few metal impurities;
white; plastic when moist; doesn't shrink
much when
dried.
32. (a) ZrO2; (b) CeO2;
(c) MgO
43. ceramics are AlN, GaN and InN
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last updated April 27, 2005