Hexane, 2-methyl-

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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
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity Value Units Method Reference Comment
Δfgas-195.0 ± 1.3kJ/molCcbProsen and Rossini, 1945ALS
Δfgas-196.2kJ/molN/ADavies and Gilbert, 1941Value computed using ΔfHliquid° value of -231.0±1.0 kj/mol from Davies and Gilbert, 1941 and ΔvapH° value of 34.8 kj/mol from Prosen and Rossini, 1945.; DRB
Quantity Value Units Method Reference Comment
gas419.99J/mol*KN/AHuffman H.M., 1961GT

Constant pressure heat capacity of gas

Cp,gas (J/mol*K) Temperature (K) Reference Comment
118.57200.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.; GT
152.76273.15
164.5 ± 0.2298.15
165.35300.
211.96400.
253.80500.
289.53600.
319.66700.
345.60800.
367.77900.
386.601000.
403.341100.
417.561200.
430.951300.
443.501400.
451.871500.

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
Δfliquid-229.8 ± 1.3kJ/molCcbProsen and Rossini, 1945ALS
Δfliquid-231. ± 1.kJ/molCcbDavies and Gilbert, 1941ALS
Quantity Value Units Method Reference Comment
Δcliquid-4811.5 ± 1.2kJ/molCcbProsen and Rossini, 1945Corresponding Δfliquid = -229.7 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Δcliquid-4810. ± 1.kJ/molCcbDavies and Gilbert, 1941Corresponding Δfliquid = -231.7 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity Value Units Method Reference Comment
liquid323.34J/mol*KN/AHuffman, Gross, et al., 1961DH
liquid315.1J/mol*KN/AHuffman, Parks, et al., 1930Extrapolation below 90 K, 70.12 J/mol*K. Based on previously published specific heat data, 30PAR/HUF.; DH
liquid314.6J/mol*KN/AParks, Huffman, et al., 1930Extrapolation below 90 K.; DH

Constant pressure heat capacity of liquid

Cp,liquid (J/mol*K) Temperature (K) Reference Comment
222.92298.15Huffman, Gross, et al., 1961T = 10 to 300 K.; DH
219.2292.4Parks, Huffman, et al., 1930T = 86 to 293 K. Value is unsmoothed experimental datum.; 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
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tboil363.2 ± 0.5KAVGN/AAverage of 44 out of 48 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus154.7 ± 0.6KAVGN/AAverage of 22 out of 23 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple154.6 ± 0.8KAVGN/AAverage of 6 values; Individual data points
Quantity Value Units Method Reference Comment
Tc530.5 ± 0.5KAVGN/AAverage of 6 values; Individual data points
Quantity Value Units Method Reference Comment
Pc27.4 ± 0.2barN/ADaubert, 1996 
Pc27.50barN/AAbara, Jennings, et al., 1988Uncertainty assigned by TRC = 0.25 bar; TRC
Pc27.328barN/AMcMicking and Kay, 1965Uncertainty assigned by TRC = 0.4053 bar; TRC
Pc27.5604barN/AEdgar and Calingaert, 1929Uncertainty assigned by TRC = 0.5066 bar; measured by Keys and Kleinschmidt; TRC
Quantity Value Units Method Reference Comment
Vc0.421l/molN/ADaubert, 1996 
Quantity Value Units Method Reference Comment
ρc2.38 ± 0.02mol/lN/ADaubert, 1996 
ρc2.38mol/lN/AMcMicking and Kay, 1965Uncertainty assigned by TRC = 0.05 mol/l; ~; TRC
Quantity Value Units Method Reference Comment
Δvap34.98kJ/molN/AMajer and Svoboda, 1985 
Δvap34.9 ± 0.1kJ/molCMajer, Svoboda, et al., 1979AC
Δvap34.8kJ/molN/AReid, 1972AC
Δvap34.8kJ/molN/AHuffman, Gross, et al., 1961Based on data from 273. to 318. K.; AC

Enthalpy of vaporization

ΔvapH (kJ/mol) Temperature (K) Method Reference Comment
30.62363.2N/AMajer and Svoboda, 1985 
34.6311.AStephenson and Malanowski, 1987Based on data from 296. to 365. K.; AC
33.9 ± 0.1313.CMajer, Svoboda, et al., 1979AC
32.7 ± 0.1333.CMajer, Svoboda, et al., 1979AC
31.3 ± 0.1353.CMajer, Svoboda, et al., 1979AC
34.8306.N/AForziati, Norris, et al., 1949Based on data from 291. to 364. K.; AC

Enthalpy of vaporization

ΔvapH = A exp(-βTr) (1 − Tr)β
    ΔvapH = Enthalpy of vaporization (at saturation pressure) (kJ/mol)
    Tr = reduced temperature (T / Tc)

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Temperature (K) A (kJ/mol) β Tc (K) Reference Comment
298. to 353.52.0.2879530.3Majer and Svoboda, 1985 

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
291.68 to 364.094.006531240.869-53.047Forziati, Norris, et al., 1949, 2Coefficents calculated by NIST from author's data.

Enthalpy of fusion

ΔfusH (kJ/mol) Temperature (K) Reference Comment
9.184154.90Huffman, Gross, et al., 1961DH
9.18154.9Domalski and Hearing, 1996AC
8.870154.0Huffman, Parks, et al., 1930DH
8.870154.0Parks, Huffman, et al., 1930DH

Entropy of fusion

ΔfusS (J/mol*K) Temperature (K) Reference Comment
59.29154.90Huffman, Gross, et al., 1961DH
57.60154.0Huffman, Parks, et al., 1930DH
57.60154.0Parks, Huffman, et al., 1930DH

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:


Henry's Law 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: Rolf Sander

Henry's Law constant (water solution)

kH(T) = H exp(d(ln(kH))/d(1/T) ((1/T) - 1/(298.15 K)))
H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(kH))/d(1/T) = Temperature dependence constant (K)

H (mol/(kg*bar)) d(ln(kH))/d(1/T) (K) Method Reference Comment
0.0019-3600.MN/A missing citation found that the solubility of 2-methylhexane increses with temperature.
0.0019-3500.XN/A 
0.00029 QN/A missing citation give several references for the Henry's law constants but don't assign them to specific species.
0.00029 LN/A 

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Notes

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

Prosen and Rossini, 1945
Prosen, E.J.; Rossini, F.D., Heats of combustion and formation of the paraffin hydrocarbons at 25° C, J. Res. NBS, 1945, 263-267. [all data]

Davies and Gilbert, 1941
Davies, G.F.; Gilbert, E.C., Heats of combustion and formation of the nine isomeric heptanes in the liquid state, J. Am. Chem. Soc., 1941, 63, 2730-2732. [all data]

Huffman H.M., 1961
Huffman H.M., Low temperature thermodynamic properties of six isomeric heptanes, J. Phys. Chem., 1961, 65, 495-503. [all data]

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]

Huffman, Gross, et al., 1961
Huffman, H.M.; Gross, M.E.; Scott, D.W.; McCullough, I.P., Low temperature thermodynamic properties of six isomeric heptanes, J. Phys. Chem., 1961, 65, 495-503. [all data]

Huffman, Parks, et al., 1930
Huffman, H.M.; Parks, G.S.; Thomas, S.B., Thermal data on organic compounds. VIII. The heat capacities, entropies and free energies of the isomeric heptanes, J. Am. Chem. Soc., 1930, 52, 3241-3251. [all data]

Parks, Huffman, et al., 1930
Parks, G.S.; Huffman, H.M.; Thomas, S.B., Thermal data on organic compounds. VI. The heat capacities, entropies and free energies of some saturated, non-benzenoid hydrocarbons, J. Am. Chem. Soc., 1930, 52, 1032-1041. [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]

Abara, Jennings, et al., 1988
Abara, J.A.; Jennings, D.W.; Kay, W.B.; Teja, A.S., Phase Behavior in the Critical Region of Six Binary Mixtures of 2-Methylalkanes, J. Chem. Eng. Data, 1988, 33, 242. [all data]

McMicking and Kay, 1965
McMicking, J.H.; Kay, W.B., Vapor Pressures and Saturated Liquid and Vapor Densities of The Isomeric Heptanes and Isomeric Octanes, Proc., Am. Pet. Inst., Sect. 3, 1965, 45, 75-90. [all data]

Edgar and Calingaert, 1929
Edgar, G.; Calingaert, G., Preparation and Properties of the Isomeric Heptanes II. Physical Prop. properties, J. Am. Chem. Soc., 1929, 51, 1540. [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]

Majer, Svoboda, et al., 1979
Majer, Vladimír; Svoboda, Václav; Hála, Slavoj; Pick, Jirí, Temperature dependence of heats of vaporization of saturated hydrocarbons C5-C8; Experimental data and an estimation method, Collect. Czech. Chem. Commun., 1979, 44, 3, 637-651, https://doi.org/10.1135/cccc19790637 . [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]

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

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