Consider the reaction 2 S(g) + 3 O2(g) → 2 SO3(g). Using the standard enthalpies of formation listed in Appendix G of your text and the bond energy of 498.4 kJ/mol in molecular oxygen, calculate the average sulfur-oxygen bond energy, in units of kJ/mol, in sulfur trioxide gas. The answer is not 473!

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Consider the reaction 2 S(g) + 3 O2(g) → 2 SO3(g). Using the standard enthalpies of formation listed in Appendix G of your text and the bond energy of 498.4 kJ/mol in molecular oxygen, calculate the average sulfur-oxygen bond energy, in units of kJ/mol, in sulfur trioxide gas. The answer is not 473!

Standard Thermodynamic Properties for Selected Substances
AH; (kJ mol)
AG; (kJ mol) s° (JKª mol-)
Substance
aluminum
Al(s)
28.3
Al(g)
324.4
285.7
164.54
A"(aq)
-531
-485
-321.7
Al2O3(s)
-1676
-1582
50.92
AIF3(s)
-1510.4
-1425
66.5
AICI3(s)
-704.2
-628.8
110.67
AICI3-6H20(s)
-2691.57
-2269.40
376.56
Al2Sa(s)
-724.0
-492.4
116.9
Al2(SO4)3(s)
-3445.06
-3506.61
239.32
antimony
Sb(s)
45.69
Sb(g)
262.34
222.17
180.16
Sb,Os(s)
-1440.55
-1268.17
220.92
SbCl3(g)
-313.8
-301.2
337.80
SbCls(g)
-394.34
-334.29
401.94
Sb;S3(s)
-174.89
-173.64
182.00
SbCla(s)
-382.17
-323.72
184.10
SBOCI(s)
-374.0
arsenic
As(s)
35.1
As(g)
302.5
261.0
174.21
Asa(g)
143.9
92.4
314
As,O6(s)
-1313.94
-1152.52
214.22
As2Os(s)
-924.87
-782.41
105.44
Telele C1
Transcribed Image Text:Standard Thermodynamic Properties for Selected Substances AH; (kJ mol) AG; (kJ mol) s° (JKª mol-) Substance aluminum Al(s) 28.3 Al(g) 324.4 285.7 164.54 A"(aq) -531 -485 -321.7 Al2O3(s) -1676 -1582 50.92 AIF3(s) -1510.4 -1425 66.5 AICI3(s) -704.2 -628.8 110.67 AICI3-6H20(s) -2691.57 -2269.40 376.56 Al2Sa(s) -724.0 -492.4 116.9 Al2(SO4)3(s) -3445.06 -3506.61 239.32 antimony Sb(s) 45.69 Sb(g) 262.34 222.17 180.16 Sb,Os(s) -1440.55 -1268.17 220.92 SbCl3(g) -313.8 -301.2 337.80 SbCls(g) -394.34 -334.29 401.94 Sb;S3(s) -174.89 -173.64 182.00 SbCla(s) -382.17 -323.72 184.10 SBOCI(s) -374.0 arsenic As(s) 35.1 As(g) 302.5 261.0 174.21 Asa(g) 143.9 92.4 314 As,O6(s) -1313.94 -1152.52 214.22 As2Os(s) -924.87 -782.41 105.44 Telele C1
(kJ mol)
AG; (kJ mol-1)
S° (JK-ª mol-3)
Substance
AsCla(g)
-261.50
-248.95
327.06
As2S3(s)
-169.03
-168.62
163.59
AsH3(g)
66.44
68.93
222.78
H3ASO.(s)
-906.3
barium
Ba(s)
62.5
Ba(g)
180
146
170.24
Ba?"(aq)
-537.6
-560.8
9.6
BaO(s)
-548.0
-520.3
72.1
Bacl2(s)
-855.0
-806.7
123.7
BasO,(s)
-1473.2
-1362.3
132.2
beryllium
Be(s)
9.50
Be(g)
324.3
286.6
136.27
BeO(s)
-609.4
-580.1
13.8
bismuth
Bi(s)
56.74
Bi(g)
207.1
168.2
187.00
BizO3(s)
-573.88
-493.7
151.5
BiCla(s)
-379.07
-315.06
176.98
BizSa(s)
-143.1
-140.6
200.4
boron
B(s)
5.86
B(g)
565.0
521.0
153.4
B203(s)
-1273.5
-1194.3
53.97
B2He(g)
36.4
87.6
232.1
H3BO3(s)
-1094.33
-968.92
88.83
Transcribed Image Text:(kJ mol) AG; (kJ mol-1) S° (JK-ª mol-3) Substance AsCla(g) -261.50 -248.95 327.06 As2S3(s) -169.03 -168.62 163.59 AsH3(g) 66.44 68.93 222.78 H3ASO.(s) -906.3 barium Ba(s) 62.5 Ba(g) 180 146 170.24 Ba?"(aq) -537.6 -560.8 9.6 BaO(s) -548.0 -520.3 72.1 Bacl2(s) -855.0 -806.7 123.7 BasO,(s) -1473.2 -1362.3 132.2 beryllium Be(s) 9.50 Be(g) 324.3 286.6 136.27 BeO(s) -609.4 -580.1 13.8 bismuth Bi(s) 56.74 Bi(g) 207.1 168.2 187.00 BizO3(s) -573.88 -493.7 151.5 BiCla(s) -379.07 -315.06 176.98 BizSa(s) -143.1 -140.6 200.4 boron B(s) 5.86 B(g) 565.0 521.0 153.4 B203(s) -1273.5 -1194.3 53.97 B2He(g) 36.4 87.6 232.1 H3BO3(s) -1094.33 -968.92 88.83
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