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Benzene, 1,2,3-trimethyl-

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Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Mass spectrum (electron ionization), 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
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity Value Units Method Reference Comment
Deltafgas-2.29 ± 0.30kcal/molCcbJohnson, Prosen, et al., 1945Hf by Prosen, Johnson, et al., 1946; ALS
Quantity Value Units Method Reference Comment
gas91.98 ± 0.15cal/mol*KN/ATaylor R.D., 1955GT

Constant pressure heat capacity of gas

Cp,gas (cal/mol*K) Temperature (K) Reference Comment
28.18200.Draeger, 1985Discrepancies with other statistically calculated values [ Taylor W.J., 1946, Hastings S.H., 1957, Thermodynamics Research Center, 1997] amount up to 5 J/mol*K in S(T) and Cp(T).; GT
35.44273.15
38.03 ± 0.1298.15
38.22300.
48.42400.
57.72500.
65.65600.
72.37700.
78.08800.
82.93900.
87.071000.
90.631100.
93.691200.
96.301300.
98.571400.
100.51500.

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
Deltafliquid-14.01 ± 0.30kcal/molCcbJohnson, Prosen, et al., 1945Hf by Prosen, Johnson, et al., 1946; ALS
Quantity Value Units Method Reference Comment
Deltacliquid-1242.36 ± 0.28kcal/molCcbJohnson, Prosen, et al., 1945Hf by Prosen, Johnson, et al., 1946; Corresponding «DELTA»fliquid = -13.99 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity Value Units Method Reference Comment
liquid64.039cal/mol*KN/ATaylor, Johnson, et al., 1955DH

Constant pressure heat capacity of liquid

Cp,liquid (cal/mol*K) Temperature (K) Reference Comment
51.730298.15Taylor, Johnson, et al., 1955T = 19 to 301 K.; DH

Phase change data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), 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:
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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
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
Tboil449.2 ± 0.2KAVGN/AAverage of 25 out of 30 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus247.6 ± 0.3KAVGN/AAverage of 14 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple247.81KN/ATaylor, Johnson, et al., 1955, 2Crystal phase 1 phase; Uncertainty assigned by TRC = 0.05 K; TRC
Ttriple247.800KN/AKilpatrick, 1953Uncertainty assigned by TRC = 0.05 K; TRC
Quantity Value Units Method Reference Comment
Tc664.5 ± 0.5KN/ATsonopoulos and Ambrose, 1995 
Tc665.50KN/AKay and Pak, 1980Uncertainty assigned by TRC = 1.5 K; TRC
Tc664.39KN/AAmbrose, Broderick, et al., 1967Uncertainty assigned by TRC = 0.1 K; TRC
Tc664.5KN/AAmbrose, Cox, et al., 1960Uncertainty assigned by TRC = 0.3 K; Visual, PRT, IPTS-48; TRC
Quantity Value Units Method Reference Comment
Pc34.1 ± 0.4atmN/ATsonopoulos and Ambrose, 1995 
Pc33.976atmN/AKay and Pak, 1980Uncertainty assigned by TRC = 0.49 atm; TRC
Pc34.09atmN/AAmbrose, Broderick, et al., 1967Uncertainty assigned by TRC = 0.06 atm; TRC
Quantity Value Units Method Reference Comment
Deltavap11.72 ± 0.04kcal/molAVGN/AAverage of 7 values; Individual data points

Enthalpy of vaporization

DeltavapH (kcal/mol) Temperature (K) Method Reference Comment
10.7378.AStephenson and Malanowski, 1987Based on data from 363. - 456. K. See also Forziati, Norris, et al., 1949.; AC
10.2265.RGHopke and Sears, 1948Based on data from 259. - 270. K.; AC

Antoine Equation Parameters

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

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Temperature (K) A B C Reference
363.48 - 450.284.160011593.958-66.072Forziati, Norris, et al., 1949, 2

Enthalpy of fusion

DeltafusH (kcal/mol) Temperature (K) Reference Comment
1.96247.8Domalski and Hearing, 1996AC

Entropy of fusion

DeltafusS (cal/mol*K) Temperature (K) Reference Comment
0.7218.7Domalski and Hearing, 1996CAL
1.4230.3
7.890247.8

Enthalpy of phase transition

DeltaHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.1574218.70crystaline, IIIcrystaline, IITaylor, Johnson, et al., 1955DH
0.31931230.27crystaline, IIcrystaline, ITaylor, Johnson, et al., 1955DH
1.9551247.81crystaline, IliquidTaylor, Johnson, et al., 1955DH

Entropy of phase transition

DeltaStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
0.719218.70crystaline, IIIcrystaline, IITaylor, Johnson, et al., 1955DH
1.39230.27crystaline, IIcrystaline, ITaylor, Johnson, et al., 1955DH
7.890247.81crystaline, IliquidTaylor, Johnson, et al., 1955DH

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

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

Data compiled by: Coblentz Society, Inc.

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


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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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, 1992
NIST MS number 125395

All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.


References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, 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.

Johnson, Prosen, et al., 1945
Johnson, W.H.; Prosen, E.J.; Rossini, F.D., Heats of combustion and isomerization of the eight C9H12 alkylbenzenes, J. Res. NBS, 1945, 35, 141-146. [all data]

Prosen, Johnson, et al., 1946
Prosen, E.J.; Johnson, W.H.; Rossini, F.D., Heats of combustion and formation at 25°C of the alkylbenzenes through C10H14, and of the higher normal monoalkylbenzenes, J. Res. NBS, 1946, 36, 455-461. [all data]

Taylor R.D., 1955
Taylor R.D., Entropy, heat capacity, and heats of transition of 1,2,3-trimethylbenzene, J. Chem. Phys., 1955, 23, 1225-1231. [all data]

Draeger, 1985
Draeger, J.A., The methylbenzenes II. Fundamental vibrational shifts, statistical thermodynamic functions, and properties of formation, J. Chem. Thermodyn., 1985, 17, 263-275. [all data]

Taylor W.J., 1946
Taylor W.J., Heats, equilibrium constants, and free energies of formation of the alkylbenzenes, J. Res. Nat. Bur. Stand., 1946, 37, 95-122. [all data]

Hastings S.H., 1957
Hastings S.H., Thermodynamic properties of selected methylbenzenes from 0 to 1000 K, J. Phys. Chem., 1957, 61, 730-735. [all data]

Thermodynamics Research Center, 1997
Thermodynamics Research Center, Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1997. [all data]

Taylor, Johnson, et al., 1955
Taylor, R.D.; Johnson, B.H.; Kilpatrick, J.E., Entropy, heat capacity, and heats of transition of 1,2,3-trimethylbenzene, J. Chem. Phys., 1955, 23, 1225-1231. [all data]

Taylor, Johnson, et al., 1955, 2
Taylor, R.D.; Johnson, B.H.; Kilpatrick, J.E., Entropy, Heat Capacity and Heats of Trans. of 1,2,3-Trimethylbenzene, J. Chem. Phys., 1955, 23, 1225. [all data]

Kilpatrick, 1953
Kilpatrick, J.E., Unpublished, 1953. [all data]

Tsonopoulos and Ambrose, 1995
Tsonopoulos, C.; Ambrose, D., Vapor-Liquid Critical Properties of Elements and Compounds. 3. Aromatic Hydrocarbons, J. Chem. Eng. Data, 1995, 40, 547-558. [all data]

Kay and Pak, 1980
Kay, W.B.; Pak, S.C., Determination of the critical constants of high-boiling hydrocarbons. Experiments with gallium as a containing fluid, J. Chem. Thermodyn., 1980, 12, 673. [all data]

Ambrose, Broderick, et al., 1967
Ambrose, D.; Broderick, B.E.; Townsend, R., The Vapour Pressures above the Normal Boiling Point and the Critical Pressures of Some Aromatic Hydrocarbons, J. Chem. Soc. , 1967, 1967, 1967, 633-41. [all data]

Ambrose, Cox, et al., 1960
Ambrose, D.; Cox, J.D.; Townsend, R., The critical temperatures of forty organic compounds, Trans. Faraday Soc., 1960, 56, 1452. [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]

Hopke and Sears, 1948
Hopke, E.R.; Sears, G.W., Vapor Pressures of Trimethylbenzenes in the Low Pressure Region 1,2, J. Am. Chem. Soc., 1948, 70, 11, 3801-3803, https://doi.org/10.1021/ja01191a077 . [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