# 12.7: Appendix 3- Bond Enthalpies

$$\newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} }$$ $$\newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}}$$$$\newcommand{\id}{\mathrm{id}}$$ $$\newcommand{\Span}{\mathrm{span}}$$ $$\newcommand{\kernel}{\mathrm{null}\,}$$ $$\newcommand{\range}{\mathrm{range}\,}$$ $$\newcommand{\RealPart}{\mathrm{Re}}$$ $$\newcommand{\ImaginaryPart}{\mathrm{Im}}$$ $$\newcommand{\Argument}{\mathrm{Arg}}$$ $$\newcommand{\norm}[1]{\| #1 \|}$$ $$\newcommand{\inner}[2]{\langle #1, #2 \rangle}$$ $$\newcommand{\Span}{\mathrm{span}}$$ $$\newcommand{\id}{\mathrm{id}}$$ $$\newcommand{\Span}{\mathrm{span}}$$ $$\newcommand{\kernel}{\mathrm{null}\,}$$ $$\newcommand{\range}{\mathrm{range}\,}$$ $$\newcommand{\RealPart}{\mathrm{Re}}$$ $$\newcommand{\ImaginaryPart}{\mathrm{Im}}$$ $$\newcommand{\Argument}{\mathrm{Arg}}$$ $$\newcommand{\norm}[1]{\| #1 \|}$$ $$\newcommand{\inner}[2]{\langle #1, #2 \rangle}$$ $$\newcommand{\Span}{\mathrm{span}}$$$$\newcommand{\AA}{\unicode[.8,0]{x212B}}$$

Average single bond enthalpies (kJ/mol)

 H-H 436 C-H 413 N-H 391 O-H 483 F-F 155 H-F 567 C-C 348 N-N 163 O-O 146 H-Cl 431 C-N 293 N-O 201 O-F 190 Cl-F 253 H-Br 366 C-O 358 N-F 272 O-Cl 203 Cl-Cl 242 H-I 299 C-F 485 N-Cl 200 O-I 234 C-Cl 328 N-Br 243 Br-F 237 C-Br 276 S-H 339 Br-Cl 218 C-I 240 P-H 322 S-F 327 Br-Br 193 C-S 259 P-F 490 S-Cl 253 S-Br 218 I-Cl 208 Si-H 323 S-S 266 I-Br 175 Si-Si 226 I-I 151 Si-C 301 Si-O 368 Si-F 565 Si-Cl 464

Average double bond enthalpies (kJ/mol)

 C=C 614 N=N 418 O=O 495 C=N 615 N=O 607 S=O 523 C=O 799 S=S 418

Average triple bond enthalpies (kJ/mol)

 C≡C 839 C≡N 891 N≡N 941 C≡O 1072

This page titled 12.7: Appendix 3- Bond Enthalpies is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by Chemistry 310 (Wikibook) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.