Heptane

Formula: C₇H₁₆
Molecular weight: 100.2019
IUPAC Standard InChI: InChI=1S/C7H16/c1-3-5-7-6-4-2/h3-7H2,1-2H3
IUPAC Standard InChIKey: IMNFDUFMRHMDMM-UHFFFAOYSA-N
CAS Registry Number: 142-82-5
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.
Isotopologues:
Other names: n-Heptane; Dipropylmethane; Heptyl hydride; Skellysolve C; n-C7H16; Eptani; Heptan; Heptanen; Gettysolve-C; NSC 62784
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Triple point temperature

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Data compiled by: Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director

T_triple (K)	Reference	Comment
183.2	Knauth and Sabbah, 1990	Uncertainty assigned by TRC = 0.1 K; TRC; Data excluded from overall average
182.57	van Miltenburg, Van Den Berg, et al., 1987	Uncertainty assigned by TRC = 0.05 K; TRC
182.59	Brown and Ziegler, 1979	Uncertainty assigned by TRC = 0.06 K; on IPTS-68. Measured in calorimeter, presumably in absence of air.; TRC
182.59	Schaake, Offringa, et al., 1979	Uncertainty assigned by TRC = 0.02 K; TRC
182.70	Meijer, Blok, et al., 1977	Uncertainty assigned by TRC = 0.2 K; TRC; Data excluded from overall average
182.56	van Miltenburg, 1972	Uncertainty assigned by TRC = 0.05 K; TRC
182.55	Messerly, Guthrie, et al., 1967	Uncertainty assigned by TRC = 0.03 K; TRC
182.55	Huffman, Gross, et al., 1961	Uncertainty assigned by TRC = 0.05 K; TRC
182.550	McCullough and Messerly, 1961	Uncertainty assigned by TRC = 0.03 K; Value measured in 1947, temp. scale not identified; TRC
182.560	McCullough and Messerly, 1961	Uncertainty assigned by TRC = 0.04 K; value measured in 1949, presumably IPTS-48; TRC
182.560	McCullough and Messerly, 1961	Uncertainty assigned by TRC = 0.04 K; value measure in 1951, presumably IPTS-48; TRC
182.550	McCullough and Messerly, 1961	Uncertainty assigned by TRC = 0.04 K; value measured in 1951, presambly IPTS-48; TRC
182.550	McCullough and Messerly, 1961	Uncertainty assigned by TRC = 0.02 K; value measured in 1954, corrected to NBS-55 temp. scale; TRC
182.55	McCullough and Messerly, 1961	Uncertainty assigned by TRC = 0.01 K; selected value based on data for samples 1-5, NBS-55 scale; TRC
182.530	Anonymous, 1959	Uncertainty assigned by TRC = 0.04 K; TRC
182.530	Anonymous, 1959	Uncertainty assigned by TRC = 0.02 K; TRC
182.56	Pilcher, 1957	Uncertainty assigned by TRC = 0.002 K; TRC
182.56	Douglas, Furukawa, et al., 1954	Uncertainty assigned by TRC = 0.01 K; by extrapolation of 1/f to 0; TRC
182.56	Ginnings and Furukawa, 1953	Uncertainty assigned by TRC = 0.01 K; TRC
182.55	Waddington, 1952	Uncertainty assigned by TRC = 0.02 K; TRC
182.56	Waddington, 1952	Uncertainty assigned by TRC = 0.02 K; TRC
182.55	Waddington, 1952	Uncertainty assigned by TRC = 0.04 K; TRC
182.55	Waddington, 1952	Uncertainty assigned by TRC = 0.02 K; TRC
182.560	Waddington, 1950	Uncertainty assigned by TRC = 0.2 K; TRC
182.560	Waddington, 1950	Uncertainty assigned by TRC = 0.2 K; TRC
182.560	Huffman, 1949	Uncertainty assigned by TRC = 0.05 K; TRC
182.560	Huffman, 1949	Uncertainty assigned by TRC = 0.03 K; TRC
183.56	Huffman, 1948	Uncertainty assigned by TRC = 0.06 K; TRC; Data excluded from overall average
187.57	Huffman, 1948	Uncertainty assigned by TRC = 0.03 K; TRC; Data excluded from overall average
182.2	Huffman, Parks, et al., 1930	Uncertainty assigned by TRC = 0.2 K; TRC; Data excluded from overall average
182.6	Parks, Huffman, et al., 1930	Uncertainty assigned by TRC = 0.2 K; TRC

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, Triple point temperature, Notes

Knauth and Sabbah, 1990
Knauth, P.; Sabbah, R., Development and applications of a low-temperature differential thermal analyzer (77 < T, K < 330), J. Therm. Anal., 1990, 36, 969-77. [all data]

van Miltenburg, Van Den Berg, et al., 1987
van Miltenburg, J.C.; Van Den Berg, G.J.K.; Van Bommel, M.J., Construction of An Adiabatic Calorimeter. Measurements of the Molar Heat Capacity of Synthetic Sapphire and of n-Heptane, J. Chem. Thermodyn., 1987, 19, 1129. [all data]

Brown and Ziegler, 1979
Brown, G.N.; Ziegler, W.T., Temperature Dependence of Excess Thermodynamic Properties of Ethanol + n-Heptane and 2-Propanol + n-Heptane Solutions, J. Chem. Eng. Data, 1979, 24, 319-30. [all data]

Schaake, Offringa, et al., 1979
Schaake, R.C.F.; Offringa, J.C.A.; Van der Berg, G.J.K.; van Miltenburg, J.C., Phase transitions in solids, studied by adiabatic calorimetry. I. Design and test of an automated adiabatic calorimeter, Recl. Trav. Chim. Pays-Bas, 1979, 98, 408. [all data]

Meijer, Blok, et al., 1977
Meijer, E.L.; Blok, J.G.; Kroon, J.; Oonk, H.A.J., The carvoxime system. IV. Heat capacities and enthalpies of melting of DL-carvoxime, L-carvoxime and standard n-heptane, Thermochim. Acta, 1977, 20, 325-34. [all data]

van Miltenburg, 1972
van Miltenburg, J.C., Construction of an adiabatic calorimeter. Thermodynamic properties of stan- dard n-heptane from 155 to 270 K and of 2,2-dichloropropane from 135 to 270 K., J. Chem. Thermodyn., 1972, 4, 773-82. [all data]

Messerly, Guthrie, et al., 1967
Messerly, J.F.; Guthrie, G.B.; Todd, S.S.; Finke, H.L., Low-Temperature Thermal Data for n-Pentane, n-Heptadecane and n-Octadecane. Revised Thermodynamic Functions for ther n-Alkanes, C5 - C18, J. Chem. Eng. Data, 1967, 12, 338-46. [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]

McCullough and Messerly, 1961
McCullough, J.P.; Messerly, J.F., , Bull. - U. S., Bur. Mines No. 596, pp 15, 1961. [all data]

Anonymous, 1959
Anonymous, R., , Am. Pet. Inst. Res. Proj. 6, Carnegie-Mellon Univ., 1959. [all data]

Pilcher, 1957
Pilcher, G., Anal. Chim. Acta, 1957, 17, 144. [all data]

Douglas, Furukawa, et al., 1954
Douglas, T.B.; Furukawa, G.T.; McCoskey, R.E.; Ball, A.F., Calorimetric properties of normal heptane from 0 deg to 520 deg K., J. Res. Natl. Bur. Stand. (U. S.), 1954, 53, 139. [all data]

Ginnings and Furukawa, 1953
Ginnings, D.C.; Furukawa, G.T., Heat Capacity Standards for the Range 14 to 1200 K, J. Am. Chem. Soc., 1953, 75, 522-7. [all data]

Waddington, 1952
Waddington, G., Personal Commun., U. S. Bur. Mines, Bartlesville, OK, March 20, 1952. [all data]

Waddington, 1950
Waddington, G., Personal Commun., U. S. Bur. Mines, Bartlesville, OK, March 2, 1950. [all data]

Huffman, 1949
Huffman, H.M., Personal Communication, U. S. Bur. Mines, Bartlesville, OK, 1949. [all data]

Huffman, 1948
Huffman, H.M., Personal Commun., U. S. Bur. Mines, Bartlesville, OK, 1948. [all data]

Huffman, Parks, et al., 1930
Huffman, H.M.; Parks, G.S.; Thomas, S.B., Thermal Data on Organic Compounds. VII The Heat Capacities, Entropies and Free Energies of the Isomeric Heptanes, J. Am. Chem. Soc., 1930, 52, 3241. [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, 1032-41. [all data]

Notes

Go To: Top, Triple point temperature, References

Symbols used in this document:

T_triple Triple point temperature
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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