Heptanal

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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-74.5 ± 0.9kcal/molCcbNicholson, 1960Heat of formation derived by Cox and Pilcher, 1970; ALS
Quantity Value Units Method Reference Comment
Δcliquid-1062.1 ± 0.9kcal/molCcbNicholson, 1960Heat of formation derived by Cox and Pilcher, 1970; Corresponding Δfliquid = -74.5 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity Value Units Method Reference Comment
liquid80.16cal/mol*KN/AD'yakova and Vasil'ev, 1982DH
liquid83.29cal/mol*KN/AParks, Kennedy, et al., 1956Extrapolation below 80 K, 56.69 J/mol*K.; DH

Constant pressure heat capacity of liquid

Cp,liquid (cal/mol*K) Temperature (K) Reference Comment
55.158298.15D'yakova and Vasil'ev, 1982Calculated from general equation: Cp(J/mol*K) = (112.44.2) - (59.943.46)x10-2T(K) + (10.930.74)x10-4T2 + (20.660.57)xnc (number of carbon atoms) + (2.650.19)x10-2Tnc.; DH
59.830298.15Parks, Kennedy, et al., 1956T = 80 to 300 K.; DH
48.90298.von Reis, 1881T = 298 to 450 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
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.

Quantity Value Units Method Reference Comment
Tboil427. ± 3.KAVGN/AAverage of 25 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus227. ± 10.KAVGN/AAverage of 5 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple229.20KN/AVasil'ev and Petrov, 1984Uncertainty assigned by TRC = 0.02 K; TRC
Ttriple229.8KN/AParks, Kennedy, et al., 1956, 2Uncertainty assigned by TRC = 0.2 K; TRC
Quantity Value Units Method Reference Comment
Tc616.7KN/AGude and Teja, 1994Uncertainty assigned by TRC = 0.6 K; by sealed ampule method; TRC
Tc161.8KN/AGude and Teja, 1994Uncertainty assigned by TRC = 0.4 K; by a flow method; TRC
Quantity Value Units Method Reference Comment
Pc31.19atmN/AGude and Teja, 1994Uncertainty assigned by TRC = 0.25 atm; by the flow method; TRC
Quantity Value Units Method Reference Comment
ρc2.30mol/lN/AGude and Teja, 1994Uncertainty assigned by TRC = 0.04 mol/l; by the sealed ampule method; TRC
Quantity Value Units Method Reference Comment
Δvap11.6kcal/molCGCChickos, Hosseini, et al., 1995Based on data from 313. to 353. K.; AC
Δvap11.3 ± 0.02kcal/molN/AD'yakova, Korichev, et al., 1981AC
Δvap11.4 ± 0.3kcal/molVNicholson, 1960Heat of formation derived by Cox and Pilcher, 1970; ALS
Δvap11.5kcal/molN/ANicholson, 1960DRB
Δvap11.5 ± 0.31kcal/molEBTurvey, Evans, et al., 1960See also Verevkin, Krasnykh, et al., 2003.; AC

Reduced pressure boiling point

Tboil (K) Pressure (atm) Reference Comment
332.80.039Weast and Grasselli, 1989BS

Enthalpy of vaporization

ΔvapH (kcal/mol) Temperature (K) Reference Comment
14.8300.Stull, 1947Based on data from 285. to 428. 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 Comment
285. to 428.2.59506686.453-161.333Stull, 1947Coefficents calculated by NIST from author's data.

Enthalpy of fusion

ΔfusH (kcal/mol) Temperature (K) Reference Comment
5.471229.3D'yakova and Vasil'ev, 1980AC
5.6370229.8Parks, Kennedy, et al., 1956DH

Entropy of fusion

ΔfusS (cal/mol*K) Temperature (K) Reference Comment
24.529229.8Parks, Kennedy, et al., 1956DH

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, 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.

Nicholson, 1960
Nicholson, G.R., 478. The heats of combustion of butanal and heptanal, J. Chem. Soc., 1960, 2377-2378. [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]

D'yakova and Vasil'ev, 1982
D'yakova, G.N.; Vasil'ev, I.A., Thermodynamic properties of aliphatic aldehydes, 1982, Termodin. [all data]

Parks, Kennedy, et al., 1956
Parks, G.S.; Kennedy, W.D.; Gates, R.R.; Mosley, J.R.; Moore, G.E.; Renquist, M.L., Thermal data on organic compounds. XXVI. Some heat capacity, entropy and free energy data for seven compounds containing oxygen., Not In System, 1956, 78, 56-59. [all data]

von Reis, 1881
von Reis, M.A., Die specifische Wärme flüssiger organischer Verbindungen und ihre Beziehung zu deren Moleculargewicht, Ann. Physik [3], 1881, 13, 447-464. [all data]

Vasil'ev and Petrov, 1984
Vasil'ev, I.A.; Petrov, V.M., Thermodynamic Properties of Oxygen-containing Organic Compounds, Handbook, Soedinenii: Khimya, Leningrad, p 240, 1984. [all data]

Parks, Kennedy, et al., 1956, 2
Parks, G.S.; Kennedy, W.D.; Gates, R.R.; Mosley, J.R.; Moore, G.E.; Renquist, M.L., Thermal Data on Organic Compounds XXVI. Some Heat Capacity, Entropy and Free Energy Data for Seven Compounds Containing Oxygen, J. Am. Chem. Soc., 1956, 78, 56-9. [all data]

Gude and Teja, 1994
Gude, M.T.; Teja, A.S., The Critical Properties of Several n-Alkanals, Tetralin and NMP, Experimental Results for DIPPR 1990-91 Projects on Phase Equilibria and Pure Component Properties, 1994, 1994, DIPPR Data Series No. 2, p.174-83. [all data]

Chickos, Hosseini, et al., 1995
Chickos, James S.; Hosseini, Sarah; Hesse, Donald G., Determination of vaporization enthalpies of simple organic molecules by correlations of changes in gas chromatographic net retention times, Thermochimica Acta, 1995, 249, 41-62, https://doi.org/10.1016/0040-6031(95)90670-3 . [all data]

D'yakova, Korichev, et al., 1981
D'yakova, G.N.; Korichev, G.L.; Korkhova, A.D.; Vasil'eva, T.F.; Vasil'ev, I.A., Zh. Prikl. Khim. (Leningrad), 1981, 54, 1644. [all data]

Turvey, Evans, et al., 1960
Turvey, J.R.; Evans, J.M.; Bhavanandan, V.P.; Wannigama, G.P.; Biddle, P.; Lane, E.S.; Willans, J.L.; Swinbourne, E.S.; Giral, F.; Hahn, L. Rodriguez; Hargreaves, G.B.; Peacock, R.D.; Schoental, R.; Cambie, R.C.; Nicholson, G.R., Notes, J. Chem. Soc., 1960, 2366, https://doi.org/10.1039/jr9600002366 . [all data]

Verevkin, Krasnykh, et al., 2003
Verevkin, Sergey P.; Krasnykh, Eugen L.; Vasiltsova, Tatiana V.; Koutek, Bohumir; Doubsky, Jan; Heintz, Andreas, Vapor pressures and enthalpies of vaporization of a series of the linear aliphatic aldehydes, Fluid Phase Equilibria, 2003, 206, 1-2, 331-339, https://doi.org/10.1016/S0378-3812(03)00035-9 . [all data]

Weast and Grasselli, 1989
CRC Handbook of Data on Organic Compounds, 2nd Editon, Weast,R.C and Grasselli, J.G., ed(s)., CRC Press, Inc., Boca Raton, FL, 1989, 1. [all data]

Stull, 1947
Stull, Daniel R., Vapor Pressure of Pure Substances. Organic and Inorganic Compounds, Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 . [all data]

D'yakova and Vasil'ev, 1980
D'yakova, G.N.; Vasil'ev, I.A., Study of the thermodynamic properties of octanal and decanal, B.S.R. Inst. Neftekhim. Protsessov (Leningrad), 1980, (1), 51. [all data]


Notes

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