Accuracy

pyrazine    498 Pyrazine

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    #  Species Formula
   488 CyanogenC2N2
   489 Dimethyldiazene (Geo)C2H6N2
   490 EthylenediamineC2H8N2
   491 1,1-DimethylhydrazineC2H8N2
   492 1,2-DimethylhydrazineC2H8N2
   493 1H-PyrazoleC3H4N2
   494 ImidazoleC3H4N2
   495 1,2-PropanediamineC3H10N2
   496 DicyanoacetyleneC4N2
   497 FumaronitrileC4H2N2
   498 Pyrazine C4H4N2
   499 PyridazineC4H4N2
   500 1,3-DiazineC4H4N2
   501 SuccinonitrileC4H4N2
   502 2-Methyl-1H-imidazoleC4H6N2
   503 (Dimethylamino) acetonitrileC4H8N2
   504 1,4,5,6-TetrahydropyrimidineC4H8N2
   505 PiperazineC4H10N2
   506 2-AminopyridineC5H6N2
   507 3-AminopyridineC5H6N2
   508 4-AminopyridineC5H6N2


ΔHf: 46.9 kcal/mol,     REF: J. O. Cox, G. Pilcher, "Thermochemistry of Organic and Organometallic Compounds," Academic Press, New York, N.Y., 1970.
  
 GEO-OK
Pyrazine
 H=46.9 HR=C&P1970
  C     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.41018548 +1    0.0000000 +0    0.0000000 +0     1     0     0
  N     1.34480654 +1  120.9819909 +1    0.0000000 +0     2     1     0
  C     1.34481401 +1  118.0069882 +1   -0.0091533 +1     3     2     1
  C     1.41031540 +1  120.9920914 +1    0.0031635 +1     4     3     2
  N     1.34487702 +1  121.0142592 +1   -0.0022064 +1     5     4     3
  H     1.09434160 +1  122.3554851 +1  179.9972961 +1     5     4     3
  H     1.09430685 +1  116.6245479 +1 -179.9946680 +1     4     3     2
  H     1.09422407 +1  116.6490102 +1 -179.9988691 +1     1     6     5
  H     1.09428233 +1  122.3137891 +1 -179.9979360 +1     2     1     6