Heptacosane
- Formula: C27H56
- Molecular weight: 380.7335
- IUPAC Standard InChIKey: BJQWYEJQWHSSCJ-UHFFFAOYSA-N
- CAS Registry Number: 593-49-7
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: n-Heptacosane
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Phase change data
Go To: Top, 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
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 |
---|---|---|---|---|---|
Tfus | 332. ± 1. | K | AVG | N/A | Average of 19 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 332. | K | N/A | Schaerer, Busso, et al., 1955 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.1 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔsubH° | 46.8 ± 7.2 | kcal/mol | B | Piacente, Pompili, et al., 1991 | AC |
Reduced pressure boiling point
Tboil (K) | Pressure (atm) | Reference | Comment |
---|---|---|---|
543.2 | 0.020 | Weast and Grasselli, 1989 | BS |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
31.5 ± 0.2 | 423. | TE | Piacente, Fontana, et al., 1994 | Based on data from 401. to 441. K.; AC |
22.5 | 523. | ME,TE,GS | Piacente, Pompili, et al., 1991 | Based on data from 508. to 570. K.; AC |
27.94 ± 0.72 | 421. | TE | Pompili and Piacente, 1990 | Based on data from 401. to 441. K.; AC |
24.93 | 488. | A,EST | Stephenson and Malanowski, 1987 | Based on data from 473. to 695. K. See also Kudchadker and Zwolinski, 1966.; 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 |
---|---|---|---|---|---|
351.3 to 434.8 | 6.25052 | 3654.268 | -86.045 | Morecroft, 1964 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
15.0 | 331.6 | DSC | Mondieig, Rajabalee, et al., 2004 | AC |
14.11 | 332.1 | DSC | Lourdin, Roux, et al., 1992 | AC |
Entropy of fusion
ΔfusS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
1.70 | 318. | Lourdin, Roux, et al., 1992, 2 | CAL |
19.30 | 325.4 | ||
42.500 | 332.1 |
Enthalpy of phase transition
ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
6.9199 | 320.25 | crystaline, II | crystaline, I | Schaerer, Busso, et al., 1955, 2 | DH |
14.440 | 331.95 | crystaline, I | liquid | Schaerer, Busso, et al., 1955, 2 | DH |
Entropy of phase transition
ΔStrs (cal/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
21.6 | 320.25 | crystaline, II | crystaline, I | Schaerer, Busso, et al., 1955, 2 | DH |
43.50 | 331.95 | crystaline, I | liquid | Schaerer, Busso, et al., 1955, 2 | DH |
References
Go To: Top, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Schaerer, Busso, et al., 1955
Schaerer, A.A.; Busso, C.J.; Smith, A.E.; Skinner, L.B.,
Properties of Pure Normal Alkanes in the C17 to C36 Range,
J. Am. Chem. Soc., 1955, 77, 2017-8. [all data]
Piacente, Pompili, et al., 1991
Piacente, Vincenzo; Pompili, Tiziano; Scardala, Paolo; Ferro, Daniela,
Temperature dependence of the vaporization enthalpies of n-alkanes from vapour-pressure measurements,
The Journal of Chemical Thermodynamics, 1991, 23, 4, 379-396, https://doi.org/10.1016/S0021-9614(05)80092-8
. [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]
Piacente, Fontana, et al., 1994
Piacente, Vincenzo; Fontana, Danilo; Scardala, Paolo,
Enthalpies of Vaporization of a Homologous Series of n-Alkanes Determined from Vapor Pressure Measurements,
J. Chem. Eng. Data, 1994, 39, 2, 231-237, https://doi.org/10.1021/je00014a009
. [all data]
Pompili and Piacente, 1990
Pompili, T.; Piacente, V.,
Enthalpy of vaporization of n-heptacosane and n-nonacosane from their vapour pressure determinations,
Thermochimica Acta, 1990, 170, 289-291, https://doi.org/10.1016/0040-6031(90)80548-D
. [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]
Kudchadker and Zwolinski, 1966
Kudchadker, A.P.; Zwolinski, B.J.,
Vapor Pressure and Boiling Points of Normal Alkanes, C 21 to C 100 .,
J. Chem. Eng. Data, 1966, 11, 2, 253-255, https://doi.org/10.1021/je60029a039
. [all data]
Morecroft, 1964
Morecroft, D.W.,
Vapor Pressures of Some High Molecular Weight Hydrocarbons.,
J. Chem. Eng. Data, 1964, 9, 4, 488-490, https://doi.org/10.1021/je60023a003
. [all data]
Mondieig, Rajabalee, et al., 2004
Mondieig, D.; Rajabalee, F.; Metivaud, V.; Oonk, H.A.J.; Cuevas-Diarte, M.A.,
n -Alkane Binary Molecular Alloys,
Chem. Mater., 2004, 16, 5, 786-798, https://doi.org/10.1021/cm031169p
. [all data]
Lourdin, Roux, et al., 1992
Lourdin, D.; Roux, A.H.; Grolier, J.-P.E.; Buisine, J.-M.,
Thermobarometric and differential scanning calorimetric study of the polymorphism of some even and odd paraffins (C26, C27, C40, C60),
Thermochimica Acta, 1992, 204, 1, 99-110, https://doi.org/10.1016/0040-6031(92)80319-R
. [all data]
Lourdin, Roux, et al., 1992, 2
Lourdin, D.; Roux, A.H.; Grolier, J.-P.E.; Buisine, J.-M.,
Thermobarometric and differential scanning calorimetric study of the polymorphism of some even and odd paraffins (C26, C27, C40, C60),
Thermochim. Acta, 1992, 204, 1, 99, https://doi.org/10.1016/0040-6031(92)80319-R
. [all data]
Schaerer, Busso, et al., 1955, 2
Schaerer, A.A.; Busso, C.J.; Smith, A.E.; Skinner, L.B.,
Properties of pure normal alkanes in the C17 to C36 range,
J. Am. Chem. Soc., 1955, 77, 2017-2019. [all data]
Notes
Go To: Top, Phase change data, References
- Symbols used in this document:
Tboil Boiling point Tfus Fusion (melting) point Ttriple Triple point temperature ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔsubH° Enthalpy of sublimation at standard conditions ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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