Hydrogen

• Formula: H₂
• Molecular weight: 2.01588
• IUPAC Standard InChI: InChI=1S/H2/h1H Copy

  
• IUPAC Standard InChIKey: UFHFLCQGNIYNRP-UHFFFAOYSA-N Copy
• CAS Registry Number: 1333-74-0
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
• Isotopologues:
  • tritium
  • deuterium hydride
  • Deuterium
• Other names: Dihydrogen; o-Hydrogen; p-Hydrogen; Molecular hydrogen; H2; UN 1049; UN 1966
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Reaction thermochemistry data (reactions 201 to 250)
  • References
  • Notes
• Other data available:
  • Gas phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data: reactions 1 to 50, reactions 51 to 100, reactions 101 to 150, reactions 151 to 200, reactions 251 to 300, reactions 301 to 350, reactions 351 to 400, reactions 401 to 450, reactions 451 to 500, reactions 501 to 550, reactions 551 to 600, reactions 601 to 621
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
  • Mass spectrum (electron ionization)
  • Constants of diatomic molecules
  • Fluid Properties
• Data at other public NIST sites:
  • Electron-Impact Ionization Cross Sections (on physics web site)
  • Computational Chemistry Comparison and Benchmark Database
  • Gas Phase Kinetics Database
• Options:
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Reaction thermochemistry data

Go To: Top, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Reactions 201 to 250

2 +  =  + 

By formula: 2H₂ + C₂H₃Cl = C₂H₆ + HCl

2 +  =

By formula: 2H₂ + C₉H₁₄ = C₉H₁₈

2 +  =

By formula: 2H₂ + C₉H₁₄ = C₉H₁₈

 +  =

By formula: H₂ + C₅H₁₁N = C₅H₁₃N

 +  =

By formula: H₂ + C₆H₁₃N = C₆H₁₅N

 + vinylxylene =

By formula: H₂ + vinylxylene = C₁₀H₁₄

2 +  =

By formula: 2H₂ + C₁₆H₁₄ = C₁₆H₁₈

 + 2 =

By formula: C₈H₁₂ + 2H₂ = C₈H₁₆

3 +  =

By formula: 3H₂ + C₈H₁₀ = C₈H₁₆

 +  =

By formula: C₈H₈ + H₂ = C₈H₁₀

2 +  =

By formula: 2H₂ + C₇H₁₀ = C₇H₁₄

 +  =

By formula: H₂ + C₅H₁₁N = C₅H₁₃N

 +  =

By formula: H₂ + C₁₀H₁₀ = C₁₀H₁₂

 +  =

By formula: C₁₀H₁₀O₂ + H₂ = C₁₀H₁₂O₂

 +  =

By formula: H₂ + C₈H₁₂O₄ = C₈H₁₄O₄

 +  =

By formula: H₂ + C₉H₁₀ = C₉H₁₂

 + C₆H₁₃N =

By formula: H₂ + C₆H₁₃N = C₆H₁₅N

 + C₆H₁₃N =

By formula: H₂ + C₆H₁₃N = C₆H₁₅N

 +  =

By formula: H₂ + C₁₀H₁₀ = C₁₀H₁₂

6 +  =

By formula: 6H₂ + C₁₄H₁₂ = C₁₄H₂₄

 +  =

By formula: H₂ + C₉H₁₀ = C₉H₁₂

2 + 2 =  + 

By formula: 2H₂ + 2C₇H₁₂ = C₇H₁₄ + C₇H₁₄

 +  =

By formula: H₂ + C₆H₁₀ = C₆H₁₂

6 +  =

By formula: 6H₂ + C₁₄H₁₄ = C₁₄H₂₆

4 +  =

By formula: 4H₂ + C₈H₈ = C₈H₁₆

10 +  = C₂₅H₅₀

By formula: 10H₂ + C₂₅H₃₀ = C₂₅H₅₀

 +  =

By formula: H₂ + C₇H₁₀O₂ = C₇H₁₂O₂

2 +  =

By formula: 2H₂ + C₁₀H₁₆ = C₁₀H₂₀

5 +  =

By formula: 5H₂ + C₁₀H₈ = C₁₀H₁₈

 + 2 =

By formula: C₁₀H₁₆ + 2H₂ = C₁₀H₂₀

 +  =

By formula: H₂ + C₆H₁₀ = C₆H₁₂

 +  =

By formula: H₂ + C₅H₈ = C₅H₁₀

 + 2 =

By formula: C₁₂H₁₄ + 2H₂ = C₁₂H₁₈

2 +  =

By formula: 2H₂ + C₁₂H₁₄ = C₁₂H₁₈

 +  =

By formula: H₂ + C₁₂H₁₆ = C₁₂H₁₈

 +  =

By formula: H₂ + C₂₇H₄₆ = C₂₇H₄₈

 +  =

By formula: H₂ + C₂₇H₄₆ = C₂₇H₄₈

2 +  =

By formula: 2H₂ + C₁₀H₁₂ = C₁₀H₁₆

2 +  =

By formula: 2H₂ + C₇H₁₀ = C₇H₁₄

 + C₂₇H₄₆ =

By formula: H₂ + C₂₇H₄₆ = C₂₇H₄₈

5 +  =

By formula: 5H₂ + C₁₀H₈ = C₁₀H₁₈

2 +  =

By formula: 2H₂ + C₈H₁₄ = C₈H₁₈

7 +  = C₁₄H₂₆

By formula: 7H₂ + C₁₄H₁₂ = C₁₄H₂₆

 +  = C₁₂H₁₈

By formula: C₁₂H₁₆ + H₂ = C₁₂H₁₈

 + 4 = C₁₅H₃₂

By formula: C₁₅H₂₄ + 4H₂ = C₁₅H₃₂

 +  =

By formula: H₂ + C₁₀H₂₀ = C₁₀H₂₂

 +  =

By formula: C₅H₈ + H₂ = C₅H₁₀

 +  =

By formula: H₂ + C₅H₈ = C₅H₁₀

2 +  =

By formula: 2H₂ + C₆H₈ = C₆H₁₂

3 +  =

By formula: 3H₂ + C₈H₈ = C₈H₁₄

References

Go To: Top, Reaction thermochemistry data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Lacher, Emery, et al., 1956
Lacher, J.R.; Emery, E.; Bohmfalk, E.; Park, J.D., Reaction heats of organic compounds. IV. A high temperature calorimeter and the hydrogenation of methyl ethyl and vinyl chlorides, J. Phys. Chem., 1956, 60, 492-495. [all data]

Lacher, Kianpour, et al., 1956
Lacher, J.R.; Kianpour, A.; Oetting, F.; Park, J.D., Reaction calorimetry. The hydrogenation of organic fluorides and chlorides, Trans. Faraday Soc., 1956, 52, 1500-1508. [all data]

Turner, Mallon, et al., 1973
Turner, R.B.; Mallon, B.J.; Tichy, M.; Doering, W.v.E.; Roth, W.R.; Schroder, G., Heats of hydrogenation. X. Conjugative interaction in cyclic dienes and trienes, J. Am. Chem. Soc., 1973, 95, 8605-8610. [all data]

Jackman and Packham, 1957
Jackman, L.M.; Packham, D.I., The experimental resonance energy of acridine, Proc. Chem. Soc., London, 1957, 349-350. [all data]

Abboud, Jimenez, et al., 1995
Abboud, J.-L.M.; Jimenez, P.; Roux, M.V.; Turrion, C.; Lopez-Mardomingo, C.; Podosenin, A.; Rogers, D.W.; Liebman, J.F., Interrelations of the energetics of amides and alkenes: enthalpies of formation of N,N-dimethyl dertivatives of pivalamide, 1-adamantylcarboxamide and benzamide, and of styrene and its a-, trans-β- and β,β-methylated derivates, J. Phys. Org. Chem., 1995, 8, 15-25. [all data]

Williams, 1942
Williams, R.B., Heats of catalytic hydrogenation in solution. I. Apparatus, technique, and the heats of hydrogenation of certain pairs of stereoisomers, J. Am. Chem. Soc., 1942, 64, 1395-1404. [all data]

Turner, Meador, et al., 1957
Turner, R.B.; Meador, W.R.; Doering, W.E.; Knox, L.H.; Mayer, J.R.; Wiley, D.W., Heats of hydrogenation. III. Hydrogenation of cycllooctatetraene and of some seven-membered non-benzenoid aromatic compounds, J. Am. Chem. Soc., 1957, 79, 4127-4133. [all data]

Allinger, Dodziuk, et al., 1982
Allinger, N.L.; Dodziuk, H.; Rogers, D.W.; Naik, S.N., Heats of hydrogenation and formation of some 5-membered ring compounds by molecular mechanics calculations and direct measurements, Tetrahedron, 1982, 38, 1593-1597. [all data]

Turner, Goebel, et al., 1968
Turner, R.B.; Goebel, P.; Mallon, B.J.; Doering, W.E.; Coburn, J.F., Jr.; Pomerantz, M., Heats of hydrogenation. VIII. Compounds with three- and four-membered rings, J. Am. Chem. Soc., 1968, 90, 4315-4322. [all data]

Scott, Cooney, et al., 1988
Scott, L.T.; Cooney, M.J.; Rogers, D.W.; Dejroongruang, K., Homoaromaticity in a cyclic polyacetylene, J. Am. Chem. Soc., 1988, 110, 7244-7245. [all data]

Roth, Lennartz, et al., 1986
Roth, W.E.; Lennartz, H.W.; Vogel, E.; Leiendecker, M.; Masaji, O., Heats of hydrogenation. 6. Resonance energy of fused [4n]annulenes, Chem. Ber., 1986, 119, 837-843. [all data]

Turner, Jarrett, et al., 1973
Turner, R.B.; Jarrett, A.D.; Goebel, P.; Mallon, B.J., Heats of hydrogenation. 9. Cyclic acetylenes and some miscellaneous olefins, J. Am. Chem. Soc., 1973, 95, 790-792. [all data]

Turner, Meador, et al., 1957, 2
Turner, R.B.; Meador, W.R.; Winkler, R.E., Heats of hydrogenation. II. Heats of hydrogenation and the acid-catalyzed isomerization of some unsaturated steroids, J. Am. Chem. Soc., 1957, 79, 4122-4127. [all data]

Roth, Klarner, et al., 1980
Roth, W.R.; Klarner, F.-G.; Lennartz, H.-W., Heats of hydrogenation. II. Heat of hydrogenation of bicyclo[2.1.0]pent-2-ene, an antiaromatic system, Chem. Ber., 1980, 113, 1806-1818. [all data]

Roth, Lennartz, et al., 1988
Roth, W.R.; Lennartz, H-W.; Doering, W.v.E.; Dolbier, W.R., Jr.; Schmidhauser, J.C., Thermochemistry of the "orthogonal" butadienes (Z,Z)-3,4-dimethylhexa-2,4-diene and 2,3-di-tert-butylbuta-1,3-diene, J. Am. Chem. Soc., 1988, 110, 1883-1889. [all data]

Notes

Go To: Top, Reaction thermochemistry data, References

• Symbols used in this document:
  

  ΔrH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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