Hydrazine

• Formula: H₄N₂
• Molecular weight: 32.0452
• IUPAC Standard InChI: InChI=1S/H4N2/c1-2/h1-2H2 Copy

  
• IUPAC Standard InChIKey: OAKJQQAXSVQMHS-UHFFFAOYSA-N Copy
• CAS Registry Number: 302-01-2
• 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: Levoxine; N2H4; Diamine; Hydrazyna; Rcra waste number U133; Hydrazine, anhydrous; Hydrazine base; Nitrogen hydride, (N2H4); Oxytreat 35
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• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data
  • Mass spectrum (electron ionization)
  • References
  • Notes
• Other data available:
  • Gas phase ion energetics data
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
  • X-ray Photoelectron Spectroscopy Database, version 5.0
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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.

Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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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Condensed 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.

Liquid 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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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 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.

Individual Reactions

 + 0.5 =  +  + 0.5

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

 + 0.5 =  +  + 0.5

By formula: C₄H₄ClNO₂ + 0.5H₄N₂ = C₄H₅NO₂ + HCl + 0.5N₂

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, Condensed 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Willis, Lossing, et al., 1976
Willis, C.; Lossing, F.P.; Back, R.A., The heat of formation of N₂H₂ and the proton affinity of N₂, Can. J. Chem., 1976, 54, 1-3. [all data]

Cole and Gilbert, 1951
Cole, L.G.; Gilbert, E.C., The heats of combustion of some nitrogen compounds and the apparent energy of the N-N bond, J. Am. Chem. Soc., 1951, 73, 5423-5427. [all data]

Tipton, Stone, et al., 1989
Tipton, T.; Stone, D.A.; KuBulat, K.; Person, W.B., Experimental and theoretical studies of the infrared spectra of hydrazines: N2H4, N2H3D, N2H2D2, N2HD3, and N2D4, J. Phys. Chem., 1989, 93, 2917. [all data]

Ferren, Miller, et al., 1957
Ferren, R.A.; Miller, J.G.; Day, A.R., J. Am. Chem. Soc., 1957, 79, 70. [all data]

Burtle, 1952
Burtle, J.G., Vapor Pressure-Composition Measurement son Aqueous Hydrazine Solutions, Ind. Eng. Chem., 1952, 44, 1675. [all data]

McMillan, 1967
McMillan, J.A., Hydrazine-1,1-Dimethylhydrazine Solid-Liquid Phase Diagram, J. Chem. Eng. Data, 1967, 12, 39. [all data]

Lempe, Neuhaeuser, et al., 1966
Lempe, D.; Neuhaeuser, S.; Maeder, H.J.; Bittrich, H.-J., Equilibriums in Ternary Liquid-Liquid Systems; Triethylamine + Water and Monoethylamine, Diethylamine, and Hydrazine, Wiss. Z. Tech. Hochsch. Chem. "Carl Schorlemmer" Leuna-Me- rseburg, 1966, 8, 158. [all data]

Bruhl, 1897
Bruhl, J.W., Spectrochemistry of nitrogen containing compounds V, Z. Phys. Chem., Stoechiom. Verwandtschaftsl., 1897, 22, 373. [all data]

Scott, Oliver, et al., 1949
Scott, D.W.; Oliver, G.D.; Gross, M.E.; Hubbard, W.N.; Huffman, H.M., Hydrazine: Heat Capacity, Heats of Fusion and Vaporization, Vapor Pressure, Entropy and Thermodynamic Functions, J. Am. Chem. Soc., 1949, 71, 2293-7. [all data]

Scott, Oliver, et al., 1949, 2
Scott, D.W.; Oliver, G.D.; Gross, Margaret E.; Hubbard, W.N.; Huffman, Hugh M., Hydrazine: Heat Capacity, Heats of Fusion and Vaporization, Vapor Pressure, Entropy and Thermodynamic Functions, J. Am. Chem. Soc., 1949, 71, 7, 2293-2297, https://doi.org/10.1021/ja01175a007 . [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]

Notes

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• Symbols used in this document:
  

  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  S°liquid,1 bar	Entropy of liquid at standard conditions (1 bar)
  Tboil	Boiling point
  Tfus	Fusion (melting) point
  Ttriple	Triple point temperature
  ΔcH°gas	Enthalpy of combustion of gas at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfH°liquid	Enthalpy of formation of liquid at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization

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