Pentane, 2,2,3,3-tetramethyl-

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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 by: Glushko Thermocenter, Russian Academy of Sciences, Moscow

Constant pressure heat capacity of gas

Cp,gas (J/mol*K) Temperature (K) Reference Comment
138.49200.Scott D.W., 1974Recommended values were obtained from the consistent correlation scheme for alkanes [ Scott D.W., 1974, 2, Scott D.W., 1974]. This approach gives a good agreement with experimental data available for alkanes. However, large uncertainties could be expected at high temperatures.
194.51273.15
212.1 ± 2.0298.15
213.34300.
277.44400.
332.71500.
380.33600.
421.75700.
457.73800.
489.11900.
517.141000.
541.831100.
564.001200.
585.761300.
602.501400.
619.231500.

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.

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
Δcliquid-6121.6 ± 1.5kJ/molCcbJohnson, Prosen, et al., 1947Corresponding Δfliquid = -278.3 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity Value Units Method Reference Comment
liquid334.8J/mol*KN/AFinke, Messerly, et al., 1976DH

Constant pressure heat capacity of liquid

Cp,liquid (J/mol*K) Temperature (K) Reference Comment
271.5298.15Finke, Messerly, et al., 1976T = 10 to 400 K.; DH

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:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tboil413.42 ± 0.04KAVGN/AAverage of 6 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus263. ± 1.KAVGN/AAverage of 6 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple263.4KN/AFinke, Messerly, et al., 1976, 2Crystal phase 1 phase; Uncertainty assigned by TRC = 0.02 K; TRC
Quantity Value Units Method Reference Comment
Tc607.5 ± 0.5KN/ADaubert, 1996 
Tc607.55KN/AAmbrose and Townsend, 1968Uncertainty assigned by TRC = 0.2 K; extrapolated back to zero time to correct for decomposition; TRC
Quantity Value Units Method Reference Comment
Pc27.4 ± 0.4barN/ADaubert, 1996 
Pc27.41barN/AAmbrose and Townsend, 1968Uncertainty assigned by TRC = 0.20 bar; TRC
Quantity Value Units Method Reference Comment
Δvap41.2kJ/molN/AReid, 1972See also Labbauf, Greenshields, et al., 1961.; AC

Enthalpy of vaporization

ΔvapH (kJ/mol) Temperature (K) Method Reference Comment
39.2343.AStephenson and Malanowski, 1987Based on data from 328. - 415. K. See also Forziati, Norris, et al., 1949.; AC

Antoine Equation Parameters

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

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Temperature (K) A B C Reference Comment
330.98 - 414.443.956741399.478-59.218Forziati, Norris, et al., 1949, 2Coefficents calculated by NIST from author's data.

Enthalpy of fusion

ΔfusH (kJ/mol) Temperature (K) Reference Comment
2.33263.4Domalski and Hearing, 1996AC

Entropy of fusion

ΔfusS (J/mol*K) Temperature (K) Reference Comment
42.0174.5Domalski and Hearing, 1996CAL
8.9263.4

Enthalpy of phase transition

ΔHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
7.32545174.45crystaline, IIcrystaline, IFinke, Messerly, et al., 1976DH
2.3326263.40crystaline, IliquidFinke, Messerly, et al., 1976DH

Entropy of phase transition

ΔStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
41.99174.45crystaline, IIcrystaline, IFinke, Messerly, et al., 1976DH
8.86263.40crystaline, IliquidFinke, Messerly, et al., 1976DH

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:


IR Spectrum

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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

Gas Phase Spectrum

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IR spectrum
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Additional Data

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Owner NIST Standard Reference Data Program
Collection (C) 2018 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin NIST Mass Spectrometry Data Center
State gas
Instrument HP-GC/MS/IRD

This IR spectrum is from the NIST/EPA Gas-Phase Infrared Database .


Mass spectrum (electron ionization)

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, 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: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Mass spectrum
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Additional Data

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Due to licensing restrictions, this spectrum cannot be downloaded.

Owner NIST Mass Spectrometry Data Center
Collection (C) 2014 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin NIST Mass Spectrometry Data Center, 1990.
NIST MS number 114372

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References

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

Scott D.W., 1974
Scott D.W., Chemical Thermodynamic Properties of Hydrocarbons and Related Substances. Properties of the Alkane Hydrocarbons, C1 through C10 in the Ideal Gas State from 0 to 1500 K. U.S. Bureau of Mines, Bulletin 666, 1974. [all data]

Scott D.W., 1974, 2
Scott D.W., Correlation of the chemical thermodynamic properties of alkane hydrocarbons, J. Chem. Phys., 1974, 60, 3144-3165. [all data]

Johnson, Prosen, et al., 1947
Johnson, W.H.; Prosen, E.J.; Rossini, F.D., Heats of combustion and isomerization of six nonanes, J. Res. NBS, 1947, 38, 419-422. [all data]

Finke, Messerly, et al., 1976
Finke, H.L.; Messerly, J.F.; Douslin, D.R., Low-temperature thermal quantities for five alkyl-substituted pentanes, J. Chem. Thermodynam., 1976, 8, 965-983. [all data]

Finke, Messerly, et al., 1976, 2
Finke, H.L.; Messerly, J.F.; Douslin, D.R., Low-Temp. Thermal Quantities for Five Alkyl-Substituted Pentanes, J. Chem. Thermodyn., 1976, 8, 965. [all data]

Daubert, 1996
Daubert, T.E., Vapor-Liquid Critical Properties of Elements and Compounds. 5. Branched Alkanes and Cycloalkanes, J. Chem. Eng. Data, 1996, 41, 365-372. [all data]

Ambrose and Townsend, 1968
Ambrose, D.; Townsend, R., Critical Temperatures and Pressures of Some Alkanes, Trans. Faraday Soc., 1968, 64, 2622. [all data]

Reid, 1972
Reid, Robert C., Handbook on vapor pressure and heats of vaporization of hydrocarbons and related compounds, R. C. Wilhort and B. J. Zwolinski, Texas A Research Foundation. College Station, Texas(1971). 329 pages.$10.00, AIChE J., 1972, 18, 6, 1278-1278, https://doi.org/10.1002/aic.690180637 . [all data]

Labbauf, Greenshields, et al., 1961
Labbauf, A.; Greenshields, J.B.; Rossini, F.D., Heats of formation, combustion, and vaporization of the 35 nonanes and 75 decanes, J. Chem. Eng. Data, 1961, 6, 261-263. [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]

Forziati, Norris, et al., 1949
Forziati, Alphonse F.; Norris, William R.; Rossini, Frederick D., Vapor pressures and boiling points of sixty API-NBS hydrocarbons, J. RES. NATL. BUR. STAN., 1949, 43, 6, 555-17, https://doi.org/10.6028/jres.043.050 . [all data]

Forziati, Norris, et al., 1949, 2
Forziati, A.F.; Norris, W.R.; Rossini, F.D., Vapor Pressures and Boiling Points of Sixty API-NBS Hydrocarbons, J. Res. Natl. Bur. Stand. (U.S.), 1949, 43, 6, 555-563, https://doi.org/10.6028/jres.043.050 . [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, IR Spectrum, Mass spectrum (electron ionization), References