Analía Bellizzi – Chemistry Classes

Ronald Reagan High School

Bond Enthalpy Values

Common Bond Energies  and Bond Lengths

 

Hydrogen

Bond

Bond Enthalpy

(kJ/mol)

Bond Length

(pm)

H-H 436 74
H-B 389 119
H-C 415 109
H-Si 318 148
H-Ge 288 153
H-Sn 251 170
H-N 386 101
H-P 322 144
H-As 247 152
H-O 459 96
H-S 363 134
H-Se 276 146
H-Te 238 170
H-F 565 92
H-Cl 428 127
H-Br 362 141
H-I 295 161
Group 13
Bond

Bond Enthalpy

(kJ/mol)

Bond Length

(pm)

B-B 293
B-O 536
B-F 613
B-Cl 456 175
B-Br 377
Group 14
Bond

Bond Enthalpy

(kJ/mol)

Bond Length

(pm)

C-C 346 154
C=C 610 134
C≡C 835 120
C-Si 318 185
C-Ge 238 195
C-Sn 192 216
C-Pb 130 230
C-N 305 147
C=N 615 129
C≡N 887 116
C-P 264 184
C-O 358 143
C=O 799 120
C≡O 1072 113
C-B 356
C-S 272 182
C=S 573 160
C-F 485 135
C-Cl 327 177
C-Br 285 194
C-I 213 214
Group 14
Bond

Bond Enthalpy

(kJ/mol)

Bond Length

(pm)

Si-Si 222 233
Si-N 355
Si-O 452 163
Si-S 293 200
Si-F 565 160
Si-Cl 381 202
Si-Br 310 215
Si-I 234 243
Ge-Ge 188 241
Ge-N 257
Ge-F 470 168
Ge-Cl 349 210
Ge-Br 276 230
Ge-I 212
Sn-F 414
Sn-Cl 323 233
Sn-Br 273 250
Sn-I 205 270
Pb-F 331
Pb-Cl 243 242
Pb-Br 201
Pb-I 142 279
Group 15
Bond

Bond Enthalpy

(kJ/mol)

Bond Length

(pm)

N-N 167 145
N=N 418 125
N≡N 942 110
N-O 201 140
N=O 607 121
N-F 283 136
N-Cl 313 175
P-P 201 221
P-O 335 163
P=O 544 150
P=S 335 186
P-F 490 154
P-Cl 326 203
P-Br 264
P-I 184
As-As 146 243
As-O 301 178
As-F 484 171
As-Cl 322 216
As-Br 458 233
As-I 200 254
Sb-Sb 121
Sb-F 440
Sb-Cl (SbCl5) 248
Sb-Cl (SbCl3) 315 232
Group 16
Bond

Bond Enthalpy

(kJ/mol)

Bond Length

(pm)

O-O 142 148
O=O 494 121
O-F 190 142
S=O 522 143
S-S (S8) 226 205
S=S 425 149
S-F 284 156
S-Cl 255 207
Se-Se 172
Se=Se 272 215
Group 17
Bond

Bond Enthalpy

(kJ/mol)

Bond Length

(pm)

F-F 155 142
Cl-Cl 240 199
Br-Br 190 228
I-I 148 267
At-At 116
I-O 201
I-F 273 191
I-Cl 208 232
I-Br 175
Group 18
Bond

Bond Enthalpy

(kJ/mol)

Bond Length

(pm)

Kr-F (KrF2) 50 190
Xe-O 84 175
Xe-F 130 195

Reference: Huheey, pps. A-21 to A-34; T.L. Cottrell, “The Strengths of Chemical Bonds,” 2nd ed., Butterworths, London, 1958; B. deB. Darwent, “National Standard Reference Data Series,” National Bureau of Standards, No. 31, Washington, DC, 1970; S.W. Benson, J. Chem. Educ., 42, 502 (1965).