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 1 to 50)
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Gas phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data: reactions 51 to 100, 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
  • 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)
  • Gas Phase Kinetics Database
• Options:
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Reaction thermochemistry data

Go To: Top, Gas phase ion energetics data, 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:
MS - José A. Martinho Simões
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
B - John E. Bartmess

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 1 to 50

 (solution) +  (solution) = 2 (solution)

By formula: C₈Co₂O₈ (solution) + H₂ (solution) = 2C₄HCoO₄ (solution)

H₃⁺ +  = (H₃⁺ • )

By formula: H₃⁺ + H₂ = (H₃⁺ • H₂)

C₁₁H₂O₁₁Os (solution) +  (solution) =  (g) +  (solution)

By formula: C₁₁H₂O₁₁Os (solution) + CO (solution) = H₂ (g) + C₁₂O₁₂Os₃ (solution)

 +  =

By formula: C₆H₁₀ + H₂ = C₆H₁₂

 (cr) +  (g) = 2C₈H₆CrO₃ (cr)

By formula: C₁₆H₁₀Cr₂O₆ (cr) + H₂ (g) = 2C₈H₆CrO₃ (cr)

 +  =

By formula: H₂ + C₆H₁₂ = C₆H₁₄

(H₃⁺ • ) +  = (H₃⁺ • 2)

By formula: (H₃⁺ • H₂) + H₂ = (H₃⁺ • 2H₂)

 +  =

By formula: H₂ + C₇H₁₄ = C₇H₁₆

 +  =

By formula: C₈H₁₆ + H₂ = C₈H₁₈

 +  =

By formula: H^- + H⁺ = H₂

 +  =

By formula: H₂ + C₅H₈ = C₅H₁₀

 +  =

By formula: H₂ + C₈H₁₄ = C₈H₁₆

0.5C₃₆H₈₄Cl₂P₄Rh₂ (solution) +  (g) = C₁₈H₄₄ClP₂Rh (solution)

By formula: 0.5C₃₆H₈₄Cl₂P₄Rh₂ (solution) + H₂ (g) = C₁₈H₄₄ClP₂Rh (solution)

 +  =

By formula: H₂ + C₆H₁₀ = C₆H₁₂

2 +  =

By formula: 2H₂ + C₆H₁₀ = C₆H₁₄

 +  =

By formula: H₂ + C₇H₁₂ = C₇H₁₄

 +  =

By formula: H₂ + C₇H₁₂ = C₇H₁₄

 +  =

By formula: H₂ + C₆H₁₀ = C₆H₁₂

C₃H₇⁺ +  = (C₃H₇⁺ • )

By formula: C₃H₇⁺ + H₂ = (C₃H₇⁺ • H₂)

Free energy of reaction

 +  = ( • )

By formula: Co⁺ + H₂ = (Co⁺ • H₂)

Enthalpy of reaction

 +  =

By formula: C₅H₁₀ + H₂ = C₅H₁₂

 +  =

By formula: C₇H₁₂ + H₂ = C₇H₁₄

 +  =

By formula: H₂ + C₇H₁₂ = C₇H₁₄

3 +  =

By formula: 3H₂ + C₇H₈ = C₇H₁₄

2 +  =

By formula: 2H₂ + C₆H₁₀ = C₆H₁₄

 + 3 =

By formula: C₅H₅N + 3H₂ = C₅H₁₁N

 +  =

By formula: C₈H₁₆ + H₂ = C₈H₁₈

 +  =

By formula: C₃H₆ + H₂ = C₃H₈

( • ) +  = ( •  • )

By formula: (Co⁺ • CH₄) + H₂ = (Co⁺ • H₂ • CH₄)

Enthalpy of reaction

 +  =

By formula: H₂ + C₃H₆O = C₃H₈O

( • ) +  = ( •  • )

By formula: (Co⁺ • H₂) + CH₄ = (Co⁺ • CH₄ • H₂)

Enthalpy of reaction

 +  =

By formula: C₈H₁₄ + H₂ = C₈H₁₆

 +  =

By formula: H₂ + C₈H₁₄ = C₈H₁₆

( • ) +  = ( • 2)

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

( • 2) +  = ( • 3)

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

( • 3) +  = ( • 4)

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

( • 4) +  = ( • 5)

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

( • 5) +  = ( • 6)

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

( • 6) +  = ( • 7)

By formula: (Co⁺ • 6H₂) + H₂ = (Co⁺ • 7H₂)

(H₃⁺ • 3) +  = (H₃⁺ • 4)

By formula: (H₃⁺ • 3H₂) + H₂ = (H₃⁺ • 4H₂)

(H₃⁺ • 2) +  = (H₃⁺ • 3)

By formula: (H₃⁺ • 2H₂) + H₂ = (H₃⁺ • 3H₂)

 +  =

By formula: H₂ + C₈H₁₆ = C₈H₁₈

2 +  =

By formula: 2H₂ + C₈H₁₄ = C₈H₁₈

 +  =

By formula: H₂ + C₈H₁₄O = C₈H₁₆O

 +  =

By formula: H₂ + C₇H₁₂ = C₇H₁₄

2 +  =

By formula: 2H₂ + C₇H₁₀ = C₇H₁₄

 +  =

By formula: H₂ + C₇H₁₀ = C₇H₁₂

 +  =

By formula: C₃H₆O + H₂ = C₃H₈O

2 +  =

By formula: 2H₂ + C₆H₈ = C₆H₁₂

 (solution) +  (solution) = 2 (solution)

By formula: C₁₀Mn₂O₁₀ (solution) + H₂ (solution) = 2C₅HMnO₅ (solution)

Gas phase ion energetics data

Go To: Top, Reaction thermochemistry data, References, Notes

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

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to H₂⁺ (ion structure unspecified)

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

 +  =

By formula: H^- + H⁺ = H₂

References

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Notes

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

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Hiraoka, K., A Determination of the Stabilities of H3+(H2)n with n=1-9 from Measurements of the gas-Phase Ion Equilibria H3+(H2)n-1 + H2 = H3+(H2)n, J. Chem. Phys., 1987, 87, 7, 4048, https://doi.org/10.1063/1.452909 . [all data]

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Notes

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• Symbols used in this document:
  

  AE	Appearance energy
  IE (evaluated)	Recommended ionization energy
  T	Temperature
  ΔrG°	Free energy of reaction at standard conditions
  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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