Physical Chemistry Third Edition

K Answers to Numerical Exercises and Odd-Numbered Numerical Problems 1313

2.61
a. ∆H◦≈76 kJ mol−^1
From enthalpy changes of formation,
∆H◦ 71 .488 kJ mol−^1
b. ∆H◦≈−542 kJ mol−^1
From enthalpy changes of formation,
∆H◦− 545 .092 kJ mol−^1

2.63
a. ∆H◦ 71 .488 kJ mol−^1
b. ∆U◦ 69 .009 kJ mol−^1
c. EB(P-Cl)≈156 kJ mol−^1

2.65
a. ∆H◦− 311 .42 kJ mol−^1
b. ∆U◦− 306 .46 kJ mol−^1
c. ∆U≈−323 kJ mol−^1
d. ∆H 373 ◦ − 315 .11 kJ mol−^1

2.67
a. vs346 m s−^1
b. vs1016 m s−^1
γ 1. 2117

2.69
a. w∆Uq 0
∆H180 J
b. same as part a

2.71
a. TRUE
b. FALSE
c.FALSE
d. FALSE
e.TRUE
f. FALSE
g. TRUE
h. FALSE
i.FALSE

2.73
T 2 217 K
tC− 56 ◦C

Chapter 3 Exercises

3.2
ηc 0. 378

3.3
a. ηr 15. 4

b. ηhp 16. 4

4. 1 × 10 −^9 dollars J−^1

c. 3. 6 × 10 −^8 dollars J−^1

3.5

∆S 40 .15JK−^1

∆Ssurr− 40 .15JK−^1

∆U 0

q−w11970 J

3.6

∆vapH 43 .93 kJ

Fg/A 9 .7 atm

∆S 124 .9JK−^1

3.7

∆S 29 .149JK−^1

3.8

a. ∆S 12 .26JK−^1

b. ∆Ssurr− 12 .26JK−^1

3.9

∆Ssurr− 9 .85JK−^1

3.10

∆S 24 .47JK−^1

∆Ssurr 0

∆Suniv 24 .47JK−^1

3.11

∆S 12 .97JK−^1

∆Ssurr− 11 .14JK−^1

∆Suniv 1 .83JK−^1

3.12

entropy production 0 .00274 J K−^1 s−^1

3.13

a. ∆Smix 5 .762JK−^1

b. ∆Smix 4 .322JK−^1

3.14

b. N 1296

c. N 21

3.15

Ω 106.^61 ×^10

24

3.19

b. ∆H− 565 .990 kJ mol−^1

c.qsurr>0 and∆Ssurr> 0