| Substance |  Hfº
(kJ/mol) |
Sº (J/K·mol) |
| C (graphite) carbon | 0.0 | 5.74 |
| CH4 (g) methane | -74.87 | 186.25 |
| C3H8 (g) propane1 | -104.7 | 270.31 |
| C3H8 (l) propane | -119.8 | 171.0 |
| CH3N2H3 (l) methylhydrazine | 54.14 | 165.94 |
| CH3CH2OH (l) ethanol | -277.0 | 159.86 |
| CO (g) carbon monoxide | -110.53 | 197.660 |
| CO2 (g) carbon dioxide | -393.51 | 213.785 |
| CaCO3 (s) calcium carbonate3 | -1207 | 92.9 |
| CaO (s) calcium oxide | -635.09 | 38.1 |
| H2 (g) hydrogen | 0.0 | 130.680 |
| H2O (g) water | -241.83 | 188.835 |
| H2O (l) water | -285.83 | 69.95 |
| H2O (s) water2 | -292.74 | 44.76 |
| N2 (g) nitrogen | 0.0 | 191.56 |
| NH3 (g) ammonia | -45.94 | 192.77 |
| N2H4 (g) hydrazine | 95.35 | 238.66 |
| N2H4 (l) hydrazine | 50.63 | 121.52 |
| NO2 (g) nitrogen dioxide | 33.10 | 240.04 |
| N2O4 (g) dinitrogen tetroxide | 9.08 | 304.38 |
| N2O4 (l) dinitrogen tetroxide | -19.56 | 209.20 |
| O2 (g) oxygen | 0.0 | 205.152 |
Sources:
Unless otherwise noted, data is from W.G. Mallard and P.J. Linstrom, Eds., NIST
Chemistry WebBook, NIST Standard Reference Database Number 69, February 2000,
National Institute of Standards and Technology, Gaithersburg MD, 20899 (http://webbook.nist.gov)
1 Entropy data from http://srdata.nist.gov/cccbdb/
2 Calculated from enthalpy of fusion data
3 Handbook of Chemistry and Physics