Physical Chemistry Third Edition

1348 K Answers to Numerical Exercises and Odd-Numbered Numerical Problems

27.17
CV,m(vib) 0 .632JK−^1 mol−^1
For 5% agreement,T3960 K
For 1% agreement,T8985 K

27.19
a. Sm−1302 J K−^1 mol−^1
b. Sm 154 .847JK−^1 mol−^1

27.21
B 2  1. 29 × 10 −^5 m^3 mol−^1

27.23
a. FALSE
b. FALSE
c.FALSE
d. TRUE
e.FALSE
f. FALSE
g. FALSE
h. TRUE

Chapter 28 Exercises

28.1
cubic,P:1
cubic,I:2
cubic,F:4
tetragonal,P:1
tetragonal,I:2
orthorhombic,P:1
orthorhombic,C:2
orthorhombic,I:2
orthorhombic,F:4
monoclinic,P:1
monoclinic,C:2
triclinic: 1
hexagonal: 1

28.2
coordination number 8
packing fraction 0. 680175

28.4
CV,m(298.15 K) 5 .983JK−^1 mol−^1

CV,m(500.0K) 14 .386JK−^1 mol−^1

CV,m(1320.0K) 22 .965JK−^1 mol−^1

28.5
c2700 m s−^1

28.11

∆S‡◦≈−13JK−^1 mol−^1

28.12

Eaη 11 .9kJmol−^1

28.16

b. q− 0 .00083 J

w 0 .00083 J

Chapter 28 Problems

28.1

a 4. 077 × 10 −^10 m 407 .7pm

d 2. 883 × 10 −^10 m

28.5

unit cell volume 1. 96 × 10 −^23 cm^3

28.7

a 4. 123 × 10 −^10 m

28.9

a. a 5. 402 × 10 −^10 m

b. ρ 1. 683 × 103 kg m−^3

28.11

a. d 110  2. 023 × 10 −^10 m

b. θ 0 .3916 radian 22. 439 ◦

28.13

b. k11Nm−^1

28.17

a. ν 2. 75 × 1012 s−^1

c.1678 K gives 95% of 3R

3799 K gives 99% of 3R

28.23

a. εF 8. 814 × 10 −^19 J 5 .50 eV

b. At 15.00 K,Cm,el 9. 63 × 10 −^3 JK−^1 mol−^1

At 298.15 K,Cm,el 0 .192JK−^1 mol−^1

28.25

a. ratio 2. 25 × 10 −^19

b. ratio 4. 51 × 10 −^19

28.27

r 1. 6 × 10 −^8 ohm m (Your value will likely differ)

The correct value is 1. 72 × 10 −^8 ohm m