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  1. Path: sparky!uunet!crdgw1!rpi!batcomputer!cornell!uw-beaver!cs.ubc.ca!fornax!jones
  2. From: jones@cs.sfu.ca (John Jones)
  3. Newsgroups: sci.chem
  4. Subject: Published values of bond energies
  5. Message-ID: <1993Jan27.190213.27488@cs.sfu.ca>
  6. Date: 27 Jan 93 19:02:13 GMT
  7. Distribution: sci.chem
  8. Organization: CSS, Simon Fraser University, Burnaby, B.C., Canada
  9. Lines: 28
  10.  
  11. I've been checking the values given for the energies of some common
  12. chemical bonds in various textbooks, and have been surprised to find wide
  13. variations in the values given.  For example, take the C-C, C=C and C[triple bond]C energies; I found the following values (in kJ/mol)
  14.  
  15.                               single              double       triple
  16.  
  17. Chemistry for                  347                 599          829
  18. Science & Engineering,
  19. Beck, Brown
  20.  
  21.  
  22. Elements of Material           370                 680         890
  23. Science and Engineering
  24. van Vlack
  25.  
  26.  
  27. Inorganic Chemistry           335                607          837
  28. J.E. Huheey
  29.  
  30.  
  31. CRC Handbook                   368                720          962
  32.  
  33.  
  34.  
  35. What is the cause of these discrepancies?  Suppose I actually needed to know the bond energies for some practical purpose, how would I come up with a reliable
  36. figure?
  37.  
  38. John Jones
  39.