Summary Pearson (Edexcel) A-Level Chemistry Chemical Reference Data Mean Bond Enthalpies List Overview

Type of bond Bond E(X—Y) (kJ mol^-1) Bond length (pm)
Single H—H 435.9 74
Single H—N 391 101 Group 1
Single H—O 464 96 Group 4
Single H—F 568 92 Group 5
Single H—Si 318 148 Group 6
Single H—P 321 144 Group 7
Single H—S 364 134
Single H—Cl 432 127
Single H—Ge 285 153
Single H—As 297 152
Single H—Se 313 146
Single H—Br 366.3 141
Single H—I 298.3 161
Single C—H (average) 413 108
Single C—H (in CH4) 435 109
Single C—C 347 154
Single C—N (average) 286 147
Single C—N (C6H5NH2) - 135
Single C—O (CH3OH) 336 143
Single C—O (average) 358 143
Single C—F (in CH3F) 452 139
Single C—F (average) 467 138
Single C—F (in CF4) 485 132
Single C—Si 307 187
Single C—Cl (CCl4) 327 177
Single C—Cl (average) 346 177
Single C—Cl (C6H5Cl) - 170
Single C—Br (CBr4) 285 194
Single C—Br (average) 290 194