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 51 to 100)
  • References
  • Notes
• Other data available:
  • Gas phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data: reactions 1 to 50, reactions 101 to 150, reactions 151 to 200, reactions 201 to 250, 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:
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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 as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
MS - José A. Martinho Simões
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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 51 to 100

2 +  =

By formula: 2H₂ + C₈H₆ = C₈H₁₀

 +  =

By formula: H₂ + C₆H₁₂ = C₆H₁₄

 +  =

By formula: H₂ + C₆H₁₂ = C₆H₁₄

 +  =

By formula: C₆H₁₂ + H₂ = C₆H₁₄

 +  =

By formula: H₂ + C₆H₁₂ = C₆H₁₄

 + 2 =

By formula: C₇H₈ + 2H₂ = C₇H₁₂

 +  =

By formula: H₂ + C₆H₁₂ = C₆H₁₄

 +  =

By formula: H₂ + C₇H₁₄ = C₇H₁₆

2 +  =

By formula: 2H₂ + C₁₀H₁₆ = C₁₀H₂₀

 +  =

By formula: H₂ + C₂H₄O = C₂H₆O

C₃₉H₆₈O₃P₂W (solution) +  (solution) = C₃₉H₆₈O₄P₂W (solution) +  (g)

By formula: C₃₉H₆₈O₃P₂W (solution) + H₂O (solution) = C₃₉H₆₈O₄P₂W (solution) + H₂ (g)

C₂₁H₄₄O₃P₂W (solution) +  (solution) = C₂₁H₄₄O₄P₂W (solution) +  (g)

By formula: C₂₁H₄₄O₃P₂W (solution) + H₂O (solution) = C₂₁H₄₄O₄P₂W (solution) + H₂ (g)

 (g) = 0.5 (g) + 4 (g) +  (cr)

By formula: C₄HCoO₄ (g) = 0.5H₂ (g) + 4CO (g) + Co (cr)

 +  =

By formula: C₄H₈O + H₂ = C₄H₁₀O

C₃₉H₆₆N₂O₃P₂W (solution) +  (g) = C₃₉H₆₈O₃P₂W (solution) +  (g)

By formula: C₃₉H₆₆N₂O₃P₂W (solution) + H₂ (g) = C₃₉H₆₈O₃P₂W (solution) + N₂ (g)

 +  =

By formula: C₄H₄O₄ + H₂ = C₄H₆O₄

2 +  =

By formula: 2H₂ + C₁₄H₁₀ = C₁₄H₁₄

C₃₉H₆₆MoO₃P₃ (solution) +  (g) = C₃₉H₆₈MoO₃P₂ (solution)

By formula: C₃₉H₆₆MoO₃P₃ (solution) + H₂ (g) = C₃₉H₆₈MoO₃P₂ (solution)

C₁₆H₃₄OP₂Ru (solution) +  (solution) = C₁₆H₃₄P₂Ru (solution) +  (solution)

By formula: C₁₆H₃₄OP₂Ru (solution) + H₂ (solution) = C₁₆H₃₄P₂Ru (solution) + H₂O (solution)

 +  =

By formula: C₆H₁₀O + H₂ = C₆H₁₂O

 +  =

By formula: H₂ + C₅H₁₀ = C₅H₁₂

 +  =

By formula: C₅H₈O + H₂ = C₅H₁₀O

 +  =

By formula: H₂ + C₆H₁₂ = C₆H₁₄

 +  =

By formula: H₂ + C₆H₁₂ = C₆H₁₄

( • ) +  = ( • 2)

By formula: (Fe⁺ • H₂) + H₂ = (Fe⁺ • 2H₂)

( • 2) +  = ( • 3)

By formula: (Fe⁺ • 2H₂) + H₂ = (Fe⁺ • 3H₂)

( • 3) +  = ( • 4)

By formula: (Fe⁺ • 3H₂) + H₂ = (Fe⁺ • 4H₂)

( • 4) +  = ( • 5)

By formula: (Fe⁺ • 4H₂) + H₂ = (Fe⁺ • 5H₂)

( • 5) +  = ( • 6)

By formula: (Fe⁺ • 5H₂) + H₂ = (Fe⁺ • 6H₂)

 +  =

By formula: H₂ + C₉H₈ = C₉H₁₀

 +  =

By formula: C₁₈H₃₄O₂ + H₂ = C₁₈H₃₆O₂

 +  =

By formula: H₂ + C₄H₈O = C₄H₁₀O

( • ) +  = ( • 2)

By formula: (Na⁺ • H₂) + H₂ = (Na⁺ • 2H₂)

( • ) +  = ( • 2)

By formula: (K⁺ • H₂) + H₂ = (K⁺ • 2H₂)

2 +  =

By formula: 2H₂ + C₁₀H₈ = C₁₀H₁₂

 +  = ( • )

By formula: Fe⁺ + H₂ = (Fe⁺ • H₂)

C₅H₂CrO₅ (g) =  (g) + C₅CrO₅ (g)

By formula: C₅H₂CrO₅ (g) = H₂ (g) + C₅CrO₅ (g)

( • ) +  = ( •  • )

By formula: (Co⁺ • H₂O) + H₂ = (Co⁺ • H₂ • H₂O)

Enthalpy of reaction

 +  =  + 

By formula: H₂ + C₃H₇F = C₃H₈ + HF

 +  = ( • )

By formula: Na⁺ + H₂ = (Na⁺ • H₂)

 +  = ( • )

By formula: K⁺ + H₂ = (K⁺ • H₂)

 +  =  + 

By formula: H₂ + C₃H₇F = C₃H₈ + HF

 +  =

By formula: H₂ + C₈H₁₂O₄ = C₈H₁₄O₄

3 +  =

By formula: 3H₂ + C₆H₈ = C₆H₁₄

3 +  =

By formula: 3H₂ + C₆H₈ = C₆H₁₄

 +  =

By formula: H₂ + C₈H₁₄ = C₈H₁₆

 +  =

By formula: H₂ + C₈H₁₄ = C₈H₁₆

3 +  =

By formula: 3H₂ + C₈H₁₀ = C₈H₁₆

 +  =

By formula: H₂ + C₁₀H₂₀ = C₁₀H₂₂

 +  =

By formula: H₂ + C₇H₁₀ = C₇H₁₂

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.

Davis, Allinger, et al., 1985
Davis, H.E.; Allinger, N.L.; Rogers, D.W., Enthalpies of hydrogenation of phenylalkynes: indirect determination of the enthalpy of formation of diphenylcyclopropenone, J. Org. Chem., 1985, 50, 3601-3604. [all data]

Rogers and McLafferty, 1971
Rogers, D.W.; McLafferty, F.J., A new hydrogen calorimeter. Heats of hydrogenation of allyl and vinyl unsaturation adjacent to a ring, Tetrahedron, 1971, 27, 3765-3775. [all data]

Flitcroft and Skinner, 1958
Flitcroft, T.L.; Skinner, H.A., Heats of hydrogenation Part 2.-Acetylene derivatives, Trans. Faraday Soc., 1958, 54, 47-53. [all data]

Rogers, Crooks, et al., 1987
Rogers, D.W.; Crooks, E.; Dejroongruang, K., Enthalpies of hydrogenation of the hexenes, J. Chem. Thermodyn., 1987, 19, 1209-1215. [all data]

Rogers and Crooks, 1983
Rogers, D.W.; Crooks, E.L., Enthalpies of hydrogenation of the isomers of n-hexene, J. Chem. Thermodyn., 1983, 15, 1087-1092. [all data]

Rogers, Papadimetriou, et al., 1975
Rogers, D.W.; Papadimetriou, P.M.; Siddiqui, N.A., An improved hydrogen microcalorimeter for use with large molecules, Mikrochim. Acta, 1975, 2, 389-400. [all data]

Rogers and Siddiqui, 1975
Rogers, D.W.; Siddiqui, N.A., Heats of hydrogenation of large molecules. I. Esters of unsaturated fatty acids, J. Phys. Chem., 1975, 79, 574-577. [all data]

Doering, Roth, et al., 1988
Doering, W.E.; Roth, W.R.; Breuckmann, R.; Figge, L.; Lennartz, H.-W.; Fessner, W.-D.; Prinzbach, F.H., Verbotene Reaktionen. - [2 + 2]-Cycloreversion starrer Cyclobutane, Chem. Ber., 1988, 121, 1-9. [all data]

Rogers, Choi, et al., 1980
Rogers, D.W.; Choi, L.S.; Girellini, R.S., Heats of hydrogenation and formation of quadricyclene, norbornadiene, norbornene, and nortricyclene, J. Phys. Chem., 1980, 84, 1810-1814. [all data]

Turner, Meador, et al., 1957
Turner, R.B.; Meador, W.R.; Winkler, R.E., Heats of hydrogenation. I. Apparatus and the heats of hydrogenation of bicyclo[2,2,1]heptene, bicyclo[2,2,1]heptadiene, bicyclo[2,2,2]octene and bicyclo[2,2,2]octadiene, J. Am. Chem. Soc., 1957, 79, 4116-4121. [all data]

Molnar, Rachford, et al., 1984
Molnar, A.; Rachford, R.; Smith, G.V.; Liu, R., Heats of hydrogenation by a simple and rapid flow calorimetric method, Appl. Catal., 1984, 9, 219-223. [all data]

Rogers and Dejroongruang, 1989
Rogers, D.W.; Dejroongruang, K., Enthalpies of hydrogenation of the dimethylpentenes, ethylpentenes, methylbutene, and trimethylbutene, J. Chem. Thermodyn., 1989, 21, 1115-1120. [all data]

Dolliver, Gresham, et al., 1937
Dolliver, M.a.; Gresham, T.L.; Kistiakowsky, G.B.; Vaughan, W.E., Heats of organic reactions. V. Heats of hydrogenation of various hydrocarbons, J. Am. Chem. Soc., 1937, 59, 831-841. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Lopes, Nunes, et al., 1975
Lopes, M.T.R.; Nunes, M.F.T.; Florencio, M.H.F.S.; Mota, M.M.G.; Fernandez, M.T.N., Heats of hydrogenation in solution. I. Calorimeter for semimicro determinations, Rev. Port. Quim., 1975, 15, 129-132. [all data]

Wiberg, Crocker, et al., 1991
Wiberg, K.B.; Crocker, L.S.; Morgan, K.M., Thermochemical studies of carbonyl compounds. 5. Enthalpies of reduction of carbonyl groups, J. Am. Chem. Soc., 1991, 113, 3447-3450. [all data]

Dolliver, Gresham, et al., 1938
Dolliver, M.A.; Gresham, T.L.; Kistiakowsky, G.B.; Smith, E.A.; Vaughan, W.E., Heats of organic reactions. VI. Heats of hydrogenation of some oxygen-containing compounds, J. Am. Chem. Soc., 1938, 60, 440-450. [all data]

Kubas, Burns, et al., 1992
Kubas, G.J.; Burns, C.J.; Khalsa, G.R.K.; van der Sluys, L.S.; Kiss, G.; Hoff, C.D., Organometallics, 1992, 11, 3390. [all data]

Bronshstein, Gankin, et al., 1966
Bronshstein, Yu.E.; Gankin, V.Yu.; Krinkin, D.P.; Rudkovskii, D.M., Russ. J. Phys. Chem., 1966, 40, 802. [all data]

Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J., Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]

Cox and Pilcher, 1970, 2
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds in Academic Press, New York, 1970. [all data]

Allinger, Glaser, et al., 1981
Allinger, N.L.; Glaser, J.A.; Davis, H.E., Heats of hydrogenation of some vinyl ethers and related compounds, J. Org. Chem., 1981, 46, 658-661. [all data]

Gonzalez and Hoff, 1989
Gonzalez, A.A.; Hoff, C.D., Inorg. Chem., 1989, 28, 4295. [all data]

Skinner and Snelson, 1959
Skinner, H.A.; Snelson, A., Heats of hydrogenation Part 3., Trans. Faraday Soc., 1959, 55, 405-407. [all data]

Flitcroft, Skinner, et al., 1957
Flitcroft, T.; Skinner, H.A.; Whiting, M.C., Heats of hydrogenation Part 1.-Dodeca-3:9 and -5:7 Diynes, Trans. Faraday Soc., 1957, 53, 784-790. [all data]

Bryndza, Fong, et al., 1987
Bryndza, H.E.; Fong, L.K.; Paciello, R.A.; Tam, W.; Bercaw, J.E., J. Am. Chem. Soc., 1987, 109, 1444. [all data]

Conn, Kistiakowsky, et al., 1939
Conn, J.B.; Kistiakowsky, G.B.; Smith, E.A., Heats of organic reactions. VIII. Some further hydrogenations, including those of some acetylenes, J. Am. Chem. Soc., 1939, 61, 1868-1876. [all data]

Kistiakowsky, Ruhoff, et al., 1936
Kistiakowsky, G.B.; Ruhoff, J.R.; Smith, H.A.; Vaughan, W.E., Heats of organic reactions. III. Hydrogenation of some higher olefins, J. Am. Chem. Soc., 1936, 58, 137-145. [all data]

Bushnell, Kemper, et al., 1995
Bushnell, J.E.; Kemper, P.R.; Bowers, M.T., Factors Affecting sigma Bond Activation in Simple Systems; Measurement of Experimental Binding energies of Fe+(H2)1-6 Clusters, J. Phys. Chem., 1995, 99, 42, 15602, https://doi.org/10.1021/j100042a040 . [all data]

Hill, Morton, et al., 1980
Hill, R.K.; Morton, G.H.; Rogers, D.W.; Choi, L.S., Rearrangement of 1,1'-spirobiindene and thermochemical evidence for its spiroconjugative destabilization, J. Org. Chem., 1980, 45, 5163-5166. [all data]

Frye and Weitkamp, 1969
Frye, C.G.; Weitkamp, A.W., Equilibrium hydrogenations of multi-ring aromatics, J. Chem. Eng. Data, 1969, 14, 372-376. [all data]

Naidus and Mueller, 1950
Naidus, E.S.; Mueller, M.B., Equilibrium studies on the hydrindene-indene-hydrogen system, J. Am. Chem. Soc., 1950, 72, 1829-1831. [all data]

Rogers, Hoyte, et al., 1978
Rogers, D.W.; Hoyte, O.P.A.; Ho, R.K.C., Heats of hydrogenation of large molecules. Part 2. Six unsaturated and polyunsaturated fatty acids, J. Chem. Soc. Faraday Trans. 1, 1978, 74, 46-52. [all data]

Buckley and Herington, 1965
Buckley, E.; Herington, E.F.G., Equilibria in some secondary alcohol + hydrogen + ketone systems, Trans. Faraday Soc., 1965, 61, 1618-1625. [all data]

Bushnell, Kemper, et al., 1994
Bushnell, J.E.; Kemper, P.R.; Bowers, M.T., Na+/K+(H2)1,2 clusters: experiment, J. Phys. Chem., 1994, 98, 8, 2044, https://doi.org/10.1021/j100059a011 . [all data]

Wilson, Caflisch, et al., 1958
Wilson, T.P.; Caflisch, E.G.; Hurley, G.F., The naphthalene-tetralin-hydrogen equilibrium at elevated temperature and pressure, J. Phys. Chem., 1958, 62, 1059. [all data]

Wells, House, et al., 1994
Wells, J.R.; House, P.G.; Weitz, E., J. Phys. Chem., 1994, 98, 8343. [all data]

Kemper, Bushnell, et al., 1993
Kemper, P.R.; Bushnell, J.; Von Koppen, P.; Bowers, M.T., Binding Energies of Co+(H2/CH4/C2H6)1,2,3 Clusters, J. Phys. Chem., 1993, 97, 9, 1810, https://doi.org/10.1021/j100111a016 . [all data]

Lacher, Kianpour, et al., 1956
Lacher, J.R.; Kianpour, A.; Park, J.D., Reaction heats of organic halogen compounds. VI. The catalytic hydrogenation of some alkyl fluorides, J. Phys. Chem., 1956, 60, 1454-1455. [all data]

Kolesov and Kozina, 1986
Kolesov, V.P.; Kozina, M.P., Thermochemistry of organic and organohalogen compounds, Russ. Chem. Rev., 1986, 55, 912. [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]

Fang and Rogers, 1992
Fang, W.; Rogers, D.W., Enthalpy of hydrogenation of the hexadienes and cis- and trans-1,3,5-hexatriene, J. Org. Chem., 1992, 57, 2294-2297. [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]

Turner and Garner, 1958
Turner, R.B.; Garner, R.H., Heats of hydrogenation. V. Relative stabilities in certain exocyclic-endocyclic olefin pairs, J. Am. Chem. Soc., 1958, 80, 1424-1430. [all data]

Turner and Garner, 1957
Turner, R.B.; Garner, R.H., Heats of hydrogenation. V. Relative stabilities in certain exocyclic-endocyclic olefin pairs, J. Am. Chem. Soc., 1957, 80, 1424-1430. [all data]

Turner, Meador, et al., 1957, 2
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]

Rogers and Skanupong, 1974
Rogers, D.W.; Skanupong, S., Heats of hydrogenation of sixteen terminal monoolefins. The alternating effect, J. Phys. Chem., 1974, 78, 2569-2572. [all data]

Bretschneider and Rogers, 1970
Bretschneider, E.; Rogers, D.W., A new microcalorimeter: heats of hydrogenation of four monoolefins, Mikrochim. Acta, 1970, 482-490. [all data]

Flury, Grob, et al., 1988
Flury, P.; Grob, C.A.; Wang, G.Y.; Lennatz, H.-W.; Roth, W.R., 113. Norbornanes. Bridging strain in norbornyl and oxanorbornyl cations, Helv. Chim. Acta, 1988, 71, 1017-1024. [all data]

Notes

Go To: Top, Reaction thermochemistry data, References

• Symbols used in this document:
  

  T	Temperature
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔrS°	Entropy of reaction at standard conditions

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