Nitrogen

• Formula: N₂
• Molecular weight: 28.0134
• IUPAC Standard InChI: InChI=1S/N2/c1-2 Copy

  
• IUPAC Standard InChIKey: IJGRMHOSHXDMSA-UHFFFAOYSA-N Copy
• CAS Registry Number: 7727-37-9
• 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.
• Other names: Nitrogen gas; N2; UN 1066; UN 1977; Dinitrogen; Molecular nitrogen; Diatomic nitrogen; Nitrogen-14
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data (reactions 1 to 50)
  • Mass spectrum (electron ionization)
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data: reactions 51 to 100, reactions 101 to 150, reactions 151 to 156
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
  • 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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Gas phase thermochemistry data

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

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
    C_p = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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View table.

Phase change data

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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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos

Enthalpy of vaporization

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
    P = vapor pressure (atm)
    T = temperature (K)

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Reaction thermochemistry data

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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:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
MS - José A. Martinho Simões
B - John E. Bartmess
ALS - 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 1 to 50

 +  = ( • )

By formula: NO^- + N₂ = (NO^- • N₂)

Free energy of reaction

 +  = ( • )

By formula: N₂⁺ + N₂ = (N₂⁺ • N₂)

 +  = ( • )

By formula: O₂⁺ + N₂ = (O₂⁺ • N₂)

Free energy of reaction

(HN₂⁺ • 4) +  = (HN₂⁺ • 5)

By formula: (HN₂⁺ • 4N₂) + N₂ = (HN₂⁺ • 5N₂)

Free energy of reaction

( • 7 • ) +  = ( • 8 • )

By formula: (O₂^- • 7N₂ • O₂) + N₂ = (O₂^- • 8N₂ • O₂)

( • 2) +  = ( • 3)

By formula: (O₂⁺ • 2N₂) + N₂ = (O₂⁺ • 3N₂)

( • ) +  = ( • 2)

By formula: (O₂⁺ • N₂) + N₂ = (O₂⁺ • 2N₂)

( • ) +  = ( • 2)

By formula: (NO^- • N₂) + N₂ = (NO^- • 2N₂)

C₃N₂NiO₃ (solution) = C₃NiO₃ (solution) +  (solution)

By formula: C₃N₂NiO₃ (solution) = C₃NiO₃ (solution) + N₂ (solution)

N⁺ +  = (N⁺ • )

By formula: N⁺ + N₂ = (N⁺ • N₂)

Enthalpy of reaction

 +  = ( • )

By formula: Cu⁺ + N₂ = (Cu⁺ • N₂)

(HN₂⁺ • 2) +  = (HN₂⁺ • 3)

By formula: (HN₂⁺ • 2N₂) + N₂ = (HN₂⁺ • 3N₂)

(HN₂⁺ • 3) +  = (HN₂⁺ • 4)

By formula: (HN₂⁺ • 3N₂) + N₂ = (HN₂⁺ • 4N₂)

(HN₂⁺ • ) +  = (HN₂⁺ • 2)

By formula: (HN₂⁺ • N₂) + N₂ = (HN₂⁺ • 2N₂)

 +  = ( • )

By formula: Na⁺ + N₂ = (Na⁺ • N₂)

Free energy of reaction

HN₂⁺ +  = (HN₂⁺ • )

By formula: HN₂⁺ + N₂ = (HN₂⁺ • N₂)

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

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

C₃₉H₆₆MoO₃P₃ (solution) +  (g) = C₃₉H₆₆MoN₂O₃P₂ (solution)

By formula: C₃₉H₆₆MoO₃P₃ (solution) + N₂ (g) = C₃₉H₆₆MoN₂O₃P₂ (solution)

( • 2 • 3) +  = ( • 3 • 3)

By formula: (H₃O⁺ • 2N₂ • 3H₂O) + N₂ = (H₃O⁺ • 3N₂ • 3H₂O)

( • 4) +  = ( • 5)

By formula: (O₂⁺ • 4N₂) + N₂ = (O₂⁺ • 5N₂)

Free energy of reaction

( • 2) +  = ( • 3)

By formula: (NO^- • 2N₂) + N₂ = (NO^- • 3N₂)

Free energy of reaction

( • 3) +  = ( • 4)

By formula: (NO^- • 3N₂) + N₂ = (NO^- • 4N₂)

Free energy of reaction

( • 3) +  = ( • 4)

By formula: (O₂⁺ • 3N₂) + N₂ = (O₂⁺ • 4N₂)

Free energy of reaction

( • 3 • 2) +  = ( • 4 • 2)

By formula: (H₃O⁺ • 3N₂ • 2H₂O) + N₂ = (H₃O⁺ • 4N₂ • 2H₂O)

( • 9) +  = ( • 10)

By formula: (NO^- • 9N₂) + N₂ = (NO^- • 10N₂)

(HN₂⁺ • 10) +  = (HN₂⁺ • 11)

By formula: (HN₂⁺ • 10N₂) + N₂ = (HN₂⁺ • 11N₂)

O₃^- +  = (O₃^- • )

By formula: O₃^- + N₂ = (O₃^- • N₂)

(C₂H₅⁺ • ) +  = (C₂H₅⁺ • 2)

By formula: (C₂H₅⁺ • N₂) + N₂ = (C₂H₅⁺ • 2N₂)

( • ) +  = ( • 2)

By formula: (N₂⁺ • N₂) + N₂ = (N₂⁺ • 2N₂)

( • ) +  = ( •  • )

By formula: (O₂⁺ • O₂) + N₂ = (O₂⁺ • N₂ • O₂)

( • ) +  = ( • 2)

By formula: (Na⁺ • N₂) + N₂ = (Na⁺ • 2N₂)

Free energy of reaction

(CH₂N⁺ • 2) +  = (CH₂N⁺ • 3)

By formula: (CH₂N⁺ • 2N₂) + N₂ = (CH₂N⁺ • 3N₂)

(CH₂N⁺ • 3) +  = (CH₂N⁺ • 4)

By formula: (CH₂N⁺ • 3N₂) + N₂ = (CH₂N⁺ • 4N₂)

(CH₂N⁺ • 4) +  = (CH₂N⁺ • 5)

By formula: (CH₂N⁺ • 4N₂) + N₂ = (CH₂N⁺ • 5N₂)

 + 0.5 =  +  + 0.5

By formula: C₄H₄BrNO₂ + 0.5H₄N₂ = HBr + C₄H₅NO₂ + 0.5N₂

 +  = ( • )

By formula: O₂^- + N₂ = (O₂^- • N₂)

C₁₂H₃₄P₄Ru (solution) +  (solution) = C₁₂H₃₂N₂P₄Ru (solution) +  (solution)

By formula: C₁₂H₃₄P₄Ru (solution) + N₂ (solution) = C₁₂H₃₂N₂P₄Ru (solution) + H₂ (solution)

( • 2 • 2) +  = ( • 3 • 2)

By formula: (H₃O⁺ • 2N₂ • 2H₂O) + N₂ = (H₃O⁺ • 3N₂ • 2H₂O)

 (solution) +  (solution) = C₈H₅N₂O₃V (solution) +  (solution)

By formula: C₉H₅O₄V (solution) + N₂ (solution) = C₈H₅N₂O₃V (solution) + CO (solution)

( • 2 • ) +  = ( • 3 • )

By formula: (O₂^- • 2N₂ • O₂) + N₂ = (O₂^- • 3N₂ • O₂)

( • 3 • ) +  = ( • 4 • )

By formula: (O₂^- • 3N₂ • O₂) + N₂ = (O₂^- • 4N₂ • O₂)

( • 4 • ) +  = ( • 5 • )

By formula: (O₂^- • 4N₂ • O₂) + N₂ = (O₂^- • 5N₂ • O₂)

( • 5 • ) +  = ( • 6 • )

By formula: (O₂^- • 5N₂ • O₂) + N₂ = (O₂^- • 6N₂ • O₂)

( • 6 • ) +  = ( • 7 • )

By formula: (O₂^- • 6N₂ • O₂) + N₂ = (O₂^- • 7N₂ • O₂)

( •  • ) +  = ( • 2 • )

By formula: (O₂^- • N₂ • O₂) + N₂ = (O₂^- • 2N₂ • O₂)

( • 2 • ) +  = ( • 3 • )

By formula: (H₃O⁺ • 2N₂ • H₂O) + N₂ = (H₃O⁺ • 3N₂ • H₂O)

( •  • 2) +  = ( • 2 • 2)

By formula: (H₃O⁺ • N₂ • 2H₂O) + N₂ = (H₃O⁺ • 2N₂ • 2H₂O)

( •  • 3) +  = ( • 2 • 3)

By formula: (H₃O⁺ • N₂ • 3H₂O) + N₂ = (H₃O⁺ • 2N₂ • 3H₂O)

( • 10) +  = ( • 11)

By formula: (O₂⁺ • 10N₂) + N₂ = (O₂⁺ • 11N₂)

( • 10) +  = ( • 11)

By formula: (N₂⁺ • 10N₂) + N₂ = (N₂⁺ • 11N₂)

Mass spectrum (electron ionization)

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

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

References

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Mass spectrum (electron ionization), 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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Giauque, W.F.; Clayton, J.O., The Heat Capacity and Entropy of Nitrogen. Heat of Vaporization. Vapor Pressures of Solid and Liquid. The Reaction 1/2 N ₂ + 1/2 O ₂ = NO from Spectroscopic Data, J. Am. Chem. Soc., 1933, 55, 12, 4875-4889, https://doi.org/10.1021/ja01339a024 . [all data]

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Speller, C.V.; Fitaire, M.; Pointu, A.M., H2CN+.nN2 Clustering Formation and the Atmosphere of Titan, Nature, 1982, 300, 5892, 507, https://doi.org/10.1038/300507a0 . [all data]

Howard and Skinner, 1966
Howard, P.B.; Skinner, H.A., Thermochemistry of some reactions of aqueous hydrazine with halogens, hydrogen halides and N-halogenosuccinimides, J. Chem. Soc. A, 1966, 1536-1540. [all data]

Pedley, Naylor, et al., 1986
Pedley, J.B.; Naylor, R.D.; Kirby, S.P., Thermochemical Data of Organic Compounds, Chapman and Hall, New York, 1986, 1-792. [all data]

Posey and Johnson, 1988
Posey, L.A.; Johnson, M.A., Pulsed Photoelectron Spectroscopy of Negative Cluster Ions: Isolation of Three Distinguishable Forms of N₂O₂^-, J. Chem. Phys., 1988, 88, 9, 5385, https://doi.org/10.1063/1.454576 . [all data]

Adams and Bohme, 1970
Adams, N.G.; Bohme, D., Flowing Afterglow Studies of Formation and Reactions of Cluster Ions of O₂⁺, O₂^-, and O^-, J. Chem. Phys., 1970, 52, 6, 3133, https://doi.org/10.1063/1.1673449 . [all data]

Belt, Scaiano, et al., 1993
Belt, S.T.; Scaiano, J.C.; Whittlesey, M.K., J. Am. Chem. Soc., 1993, 115, 1921. [all data]

Johnson, Popov, et al., 1991
Johnson, F.P.A.; Popov, V.K.; George, M.W.; Bagratashvili, V.N.; Poliakoff, M.; Turner, J.J., Mendeleev Commun., 1991, 145.. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Mass spectrum (electron ionization), References

• Symbols used in this document:
  

  Pc	Critical pressure
  Ptriple	Triple point pressure
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  T	Temperature
  Tboil	Boiling point
  Tc	Critical temperature
  Tfus	Fusion (melting) point
  Ttriple	Triple point temperature
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔrS°	Entropy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization
  ρc	Critical density

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