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Normal Alkenes, Paul, Hanns-Ingolf; Krug, Joseph; Knapp, Helmut, Osborne, N.S. Heat capacities of polar substances (nitrobenzene and benzonitrile) in alkane solutions, The molar heat of vaporization of octane (C 8 H 18) is 38.8 kJ/mol. Roux, A.H.; Grolier, J.-P.E. Mater., 2004, 16, 5, 786-798, https://doi.org/10.1021/cm031169p Eng. [all data], Lewis and Hamill, 1970 She has taught science courses at the high school, college, and graduate levels. ; Andolenko, R.A., J. Phys. Vapor Pressures and Boiling Points of Some Paraffin, Alkylcyclopentane, Alkylcyclohexane, and Alkylbenzene Hydrocarbons, [all data], Zaripov, 1982 In addition to the Thermodynamics Research Center v Ionization of normal alkanes: Enthalpy, entropy, structural, and isotope effects, J. J. Chem. n-octane, C 8 H 18 boils at 125.7 °C. [all data], Connolly, Sage, et al., 1951 Cyclic acetylenes and some miscellaneous olefins, [all data], Lainez, Rodrigo, et al., 1985 Uchebn. Further studies on the heat capacities, entropies and free energies of hydrocarbons, 2. in these sites and their terms of usage. Soc., Prosen, E.J. Eng. Vapor-Liquid Critical Properties of Elements and Compounds. Chemical Thermodynamic Properties of Hydrocarbons and Related Substances. Uchebn. Riedel proposed an empirical equation for estimating a liquid's heat of vaporization at its normal boiling point. Data compiled as indicated in comments: Heat capacity of octane at high pressures, Data, 1973, 18, 2, 115-126, https://doi.org/10.1021/je60057a009 ; Wilhelm, E., of all reactions involving this species. Sterochemical studies - XXXVI. Zaved., that these items are necessarily the best available for the purpose. Scott D.W., View plot ; Rossini, F.D., Stephenson, Richard M.; Malanowski, Stanislaw, Chem., 1986, 64, 2139-2141. Flitcroft, T.L. Flitcroft, T.; Skinner, H.A. Ambrose, D.; Tsonopoulos, C., Care must be taken, however, when using enthalpies of vaporization to measure the strength of intermolecular forces, as these forces may persist to an extent in the gas phase (as is the case with hydrogen fluoride), and so the calculated value of the bond strength will be too low. Thermodynamic calculation of the equilibrium composition of isomeric octenes in dehydrogenation of n-octane, ; Pignocco, J.M. Domalski, Eugene S.; Hearing, Elizabeth D., Izv. Commun., 1979, 44, 3, 637-651, https://doi.org/10.1135/cccc19790637 Willingham, C.B. Here is, Blog about Cheméo's technical and scientific challenges. ; Barmore, M., Eng. ; Ausloos, P., [all data], Banipal, Garg, et al., 1991 Thermal data on organic compounds. by the U.S. Secretary of Commerce on behalf of the U.S.A. For an empirical expression, equation (3) is surprisingly accurate and its error rarely exceeds 5 %. As the liquid and gas are in equilibrium at the boiling point (Tb), ΔvG = 0, which leads to: As neither entropy nor enthalpy vary greatly with temperature, it is normal to use the tabulated standard values without any correction for the difference in temperature from 298 K. A correction must be made if the pressure is different from 100 kPa, as the entropy of a gas is proportional to its pressure (or, more precisely, to its fugacity): the entropies of liquids vary little with pressure, as the compressibility of a liquid is small. ; Inghram, M.G., Pitzer K.S., J. RES. Soc., 1979, 101, 671-676. Thermodyn., 1981, 13, 415-421. TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director [all data], Lias, 1982 Experimental entropy value is based on the results [, Recommended values were obtained from the consistent correlation scheme for alkanes [. [all data], Finke, Gross, et al., 1954 Chem. C p,gas: Ideal gas heat capacity (J/mol×K). Photoionization of alkanes. ; Waddington, G.; Huffman, H.M., Heats of combustion and formation of the paraffin hydrocarbons at 25° C, Data compilation copyright     Tr = reduced temperature (T / Tc). Extrapolation below 90 K, 75.73 J/mol*K.; Extrapolation below 90 K, 77.19 J/mol*K.; T = 297 to 410 K. Unsmoothed experimental datum given as 2.210 KJ/kg*K.; T = 92 to 298 K. Value is unsmoothed experimental datum. BUR. The mathematical formula used to calculate molar enthalpy of vaporization is: Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. n-Hexane, methylcyclopentane, and n-octane, Heat capacities and densities of liquid n-octane, n-nonane, n-decane, and n-hexadecane at temperatures from 318.15 to 373.15 K and at pressures up to 10 MPa, Ber. [all data], Scott D.W., 1974 NBS, 1944, 33, 255-272. Deviations from the linear model can be described by a term with 2nd-order dependence on ethanol content with a single scaling parameter (P g ). Dissociation of excited molecular ions, Am. Figure 1: Heats of vaporization versus temperature. LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard ; T = 85 to 294 K. Value is unsmoothed experimental datum. J. Alkanes and chloro-, bromo- and iodoalkanes, Lainez, A.; Rodrigo, M.; Roux, A.H.; Grolier, J.-P.E. Heats of hydrogenation of large molecules. Every substance has its own molar heat of vaporization. [all data], Grolier, Inglese, et al., 1981 A general reaction search 9. k°H = Henry's law constant for solubility in water at 298.15 K (mol/kg*bar) Finke, H.L. Tardajos, G.; Aicart, E.; Costas, M.; Patterson, D., Am. ; Rossini, F.D., NIST Standard Reference intended to imply recommendation or endorsement by the National ; D'Arcy, P.J., Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), References, Notes, kH(T) = k°H exp(d(ln(kH))/d(1/T) ((1/T) - 1/(298.15 K))) following TRC products: Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), References, Notes, Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein. Heat capacities of binary mixtures of n-octane with each of the hexane isomers at 298.15 K, Found a problem? [1][2][3][4] However, data is not always available for certain liquids or at certain temperatures. ; Ahluwalia, J.C., Watson's equation has achieved wide acceptance and is simple and reliable. The molar heat of vaporization for water is 40.7 kJ/mol. Download as Excel file J. Chem. J. Prosen, E.J. An approach to conformational analysis of medium ring compounds. J. Res. Shakirov, R.F. Heat capacity and corresponding states in alkan-1-ol-n-alkane systems, J. Chem. Bondi, A., Chem. J. Chem. As an example of using the Clausius-Clapeyron equation, given that the vapor pressure of benzene is 1 atm at 353 K and 2 atm at 377 K, benzene's heat of vaporization is obtained as 32,390 J/mol within that temperature range. Note: Cheméo is only indexing the data, follow the source links to retrieve the latest data. InChI=1S/C8H18/c1-3-5-7-8-6-4-2/h3-8H2,1-2H3, National Institute of Standards and Thermochemical information from ion-molecule rate constants, ; Lacey, W.N., Iz. STAN., 1945, 35, 3, 219-17, https://doi.org/10.6028/jres.035.009 ; Gross, M.E. J. Chem. [all data], Benson and D'Arcy, 1986 Experimental vapor heat capacities and heats of vaporization of seven octanes,     T = temperature (K). Zaripov, Z.I., J. Spectrom. Turner, R.B. Vyssh. Roth, W.R.; Scholz, B.P. Troutons's rule, dating back to 1883,[12][13] is a relation between a liquid's heat of vaporization and it's normal boiling point Tn. [all data], Prosen and Rossini, 1945 The references used may be made clearer with a different or consistent style of citation and footnoting. Estimation of the enthalpy of vaporization of electrolyte solutions can be simply carried out using equations based on the chemical thermodynamic models, such as Pitzer model[1] or TCPC model.[2]. ; Inglese, A.; Wilhelm, E., McKay, R.A.; Sage, B.H., J. reaction search for this species. [all data], Majer, Svoboda, et al., 1979 Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Notes, Good, 1972 its accompanying search program. NATL. Heats of hydrogenation Part 1.-Dodeca-3:9 and -5:7 Diynes, ; Pignocco, J.M. (1 − Tr)β [all data], Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), References. Because energy is required to vaporize a liquid, molar enthalpy of vaporization has a positive sign. Heats of hydrogenation Part 2.-Acetylene derivatives, The enthalpies of combustion and formation of n-octane and 2,2,3,3-tetramethylbutane, been selected on the basis of sound scientific judgment. Molnar, A.; Rachford, R.; Smith, G.V. Grolier, J.P.E. Measurements of VLE, hE and vE for binary mixtures of n-alkanes with n-alkylbenzenes, {\displaystyle \Delta _{\text{v}}S} [all data], Grigor'ev and Andolenko, 1984 Volume III, Investigation of the isobaric heat capacity of n-paraffinic hydrocarbons at atmospheric pressure, Izv.

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