Physical Chemistry Third Edition

A Tables of Numerical Data 1225

Table A.9 Average Bond Energies

Bond Bond Energy/kJ mol−^1

Br−Br 193

C−C 343

CC 615

C≡C 812

C−Cl 326

C−F 490

C−H 416

C−N 290

C≡N 891

C−O 351

CO 724

CO (in CO 2 ) 799

C≡O 1046

Cl−Cl 244

F−F 158

H−Br 366

H−Cl 432

H−H 436

H−F 568

H−I 298

H−N 391

H−S 367

N−N 160

N≡N 946

N−O 176

O−H 464

O−O 144

OO (in O 2 ) 498

From F. T. Wall,Chemical Thermodynamics, 3rd ed., W. H. Freeman,

San Francisco, 1974, p. 63.

Table A.10 Surface Tension Values

Substance In Contact With Temperature/◦C Value/Nm−^1

Acetone air 0 0. 02621

air 20 0. 02370

air 40 0. 02116

Argon vapor − 188 0. 0132

Benzene air 20 0. 02885

vapor 20 0. 02889

Carbon dioxide vapor − 25 0. 00913

vapor 20 0. 00116

Carbon tetrachloride vapor 20 0. 02695

Ethanol vapor 20 0. 02275

Glycerol air 20 0. 0634

Gold H 2 ,Ar 1120 1. 128

Mercury air 20 0. 4355

Water air 20 0. 07275

air 25 0. 07197

air 30 0. 07118

From R. C. Weast,Handbook of Chemistry and Physics, 51st ed., CRC Publishing Co.,

Boca Raton, FL, 1970, p. F33ff.