Hydrazine, methyl-

Data at NIST subscription sites:

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.


Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Phase change 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 by: Donald R. Burgess, Jr.

Quantity Value Units Method Reference Comment
Δfgas22.6kcal/molN/ACole and Gilbert, 1951Value computed using ΔfHliquid° value of 54.14 kj/mol from Cole and Gilbert, 1951 and ΔvapH° value of 40.37 kj/mol from missing citation.

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change 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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Δfliquid12.94kcal/molCmCole and Gilbert, 1951ALS
Quantity Value Units Method Reference Comment
Δcliquid-311.95 ± 0.14kcal/molCcbAston, Rock, et al., 1952Reanalyzed by Cox and Pilcher, 1970, Original value = -311.71 ± 0.14 kcal/mol; ALS
Δcliquid-311.94kcal/molCmCole and Gilbert, 1951ALS
Quantity Value Units Method Reference Comment
liquid39.661cal/mol*KN/AAston, Fink, et al., 1951DH

Constant pressure heat capacity of liquid

Cp,liquid (cal/mol*K) Temperature (K) Reference Comment
32.249298.15Aston, Fink, et al., 1951T = 15 to 298 K.; DH

Phase change data

Go To: Top, Gas phase thermochemistry data, Condensed phase 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 compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos

Quantity Value Units Method Reference Comment
Tboil364.KN/AMajer and Svoboda, 1985 
Quantity Value Units Method Reference Comment
Ttriple220.79KN/AAston, Finke, et al., 1951Uncertainty assigned by TRC = 0.02 K; TRC
Quantity Value Units Method Reference Comment
Δvap9.68kcal/molN/AMajer and Svoboda, 1985 
Δvap9.648kcal/molVAston, Fink, et al., 1951, 2ALS

Enthalpy of vaporization

ΔvapH (kcal/mol) Temperature (K) Method Reference Comment
9.6479298.15N/AAston, Fink, et al., 1951P = 6.62 kPa; DH
8.633364.N/AMajer and Svoboda, 1985 
9.99286.AStephenson and Malanowski, 1987Based on data from 274. to 299. K. See also Aston, Fink, et al., 1951.; AC

Entropy of vaporization

ΔvapS (cal/mol*K) Temperature (K) Reference Comment
32.359298.15Aston, Fink, et al., 1951P; DH

Antoine Equation Parameters

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

View plot Requires a JavaScript / HTML 5 canvas capable browser.

Temperature (K) A B C Reference Comment
275.11 to 298.323.962161115.19-81.502Aston, Fink, et al., 1951Coefficents calculated by NIST from author's data.

Enthalpy of fusion

ΔfusH (kcal/mol) Temperature (K) Reference Comment
2.4900220.79Aston, Fink, et al., 1951DH
2.490220.8Domalski and Hearing, 1996AC

Entropy of fusion

ΔfusS (cal/mol*K) Temperature (K) Reference Comment
11.28220.79Aston, Fink, et al., 1951DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Notes

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

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]

Aston, Rock, et al., 1952
Aston, J.G.; Rock, E.J.; Isserow, S., The heats of combustion of the methyl substituted hydrazines and some observations on the burning of volatile liquids, J. Am. Chem. Soc., 1952, 74, 2484-24. [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]

Aston, Fink, et al., 1951
Aston, J.G.; Fink, H.L.; Janz, G.J.; Russell, K.E., The heat capacity, heats of fusion and vaporization, vapor pressures, entropy and thermodynamic functions of methyl hydrazine, J. Am. Chem. Soc., 1951, 73, 1939-1943. [all data]

Majer and Svoboda, 1985
Majer, V.; Svoboda, V., Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]

Aston, Finke, et al., 1951
Aston, J.G.; Finke, H.L.; Janz, G.J.; Russell, K.E., The Heat Capacity, Heats of Fusion and Vaporization, Vapor Pressures, Entropy and Thermodynamic Functions of Methylhydrazine, J. Am. Chem. Soc., 1951, 73, 1939. [all data]

Aston, Fink, et al., 1951, 2
Aston, J.G.; Fink, H.L.; Janz, G.J.; Russell, K.E., The heat capacity, heats of fusion and vaporization, vapor pressures, entropy and thermodynamic functions of methylhydrazine, J. Am. Chem. Soc., 1951, 73, 1939-19. [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, References