Compound Information 

Name: heneicosane
Formula: C21H44
Molar Mass: 296.583
Additional Names: henicosane
n-heneicosane
Image of heneicosane

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Property Availability 

For this compound, WTT contains critically evaluated recommendations for:
(Please note that if more than 50 points are used for regression, only the 50 most-constraining points are reported)

  • Triple point temperature
    • Triple point temperature (Crystal 1, Liquid, and Gas)
      22 experimental data points
    • Triple point temperature (Crystal 2, Crystal 1, and Gas)
      5 experimental data points
  • Normal boiling temperature (Liquid and Gas)
    • Critical temperature (Liquid and Gas)
      1 experimental data points
      • Critical pressure (Liquid and Gas)
        1 experimental data points
        • Boiling temperature (Liquid in equilibrium with Gas) as a function of Pressure
          Pressure from 5.9931e-006 kPa to 1030.38 kPa
          • Phase boundary pressure (Liquid in equilibrium with Gas) as a function of Temperature
            Temperature from 313.54 K to 777.6 K
            50 experimental data points
            • Critical density (Liquid and Gas)
              • Density
                • Density (Liquid in equilibrium with Gas) as a function of Temperature
                  Temperature from 313.54 K to 777.6 K
                  43 experimental data points
                • Density (Gas) as a function of Temperature and Pressure
                  Temperature from 430 K to 735 K
                  Pressure from 0.0001 kPa to 100 kPa
                • Density (Gas in equilibrium with Liquid) as a function of Temperature
                  Temperature from 623.543 K to 777.6 K
              • Enthalpy of phase transition
                • Enthalpy of phase transition (Crystal 1 to Liquid in equilibrium with Gas)
                  2 experimental data points
                • Enthalpy of phase transition (Crystal 2 to Crystal 1 in equilibrium with Gas)
                  3 experimental data points
              • Enthalpy of vaporization or sublimation (Liquid to Gas) as a function of Temperature
                Temperature from 313.54 K to 777.6 K
                1 experimental data points
                • Heat capacity at saturation pressure (Liquid in equilibrium with Gas) as a function of Temperature
                  Temperature from 313.54 K to 760 K
                  8 experimental data points
                  • Heat capacity at constant pressure (Ideal Gas) as a function of Temperature
                    Temperature from 200 K to 1000 K
                    • Enthalpy (Ideal Gas) as a function of Temperature
                      Temperature from 200 K to 1000 K
                      • Entropy
                        • Entropy (Ideal Gas) as a function of Temperature and Pressure
                          Temperature from 200 K to 1000 K
                        • Entropy (Liquid in equilibrium with Gas) as a function of Temperature
                          Temperature from 313.54 K to 760 K
                      • Refractive index (Liquid in equilibrium with Gas) as a function of Wavelength and Temperature
                        Temperature from 323.127 K to 566.332 K
                        3 experimental data points
                        • Surface tension (Liquid in equilibrium with Gas) as a function of Temperature
                          Temperature from 335.134 K to 573.111 K
                          13 experimental data points
                          • Viscosity
                            • Viscosity (Liquid in equilibrium with Gas) as a function of Temperature
                              Temperature from 320 K to 770 K
                              3 experimental data points
                            • Viscosity (Gas) as a function of Temperature and Pressure
                              Temperature from 640 K to 1160 K
                          • Thermal conductivity
                            • Thermal conductivity (Gas) as a function of Temperature and Pressure
                              Temperature from 640 K to 1160 K
                            • Thermal conductivity (Liquid in equilibrium with Gas) as a function of Temperature
                              Temperature from 320 K to 690 K
                          • Enthalpy of formation
                            • Enthalpy of formation (Gas)
                            • Enthalpy of formation (Liquid)

                          About WTT 

                          NIST/TRC Web Thermo Tables (WTT)
                          NIST Standard Reference Subscription Database 3 - Professional Edition
                          Version 2-2012-1-Pro

                          This web application provides access to a collection of critically evaluated thermodynamic property data for pure compounds with a primary focus on organics. These data were generated through dynamic data analysis, as implemented in the NIST ThermoData Engine software package [1, 2, 3, 4, 5, 6]. Some critically evaluated data from the historical TRC Thermodynamic Tables archive [7, 8] are included, also. As of May 2012, the Professional Edition contains information on 28432 compounds and total of 531486 evaluated data points. The properties covered by both versions (32 total) are described in Properties and Implemented Models.

                          Developed by Kenneth Kroenlein, Chris D. Muzny, Andrei F. Kazakov, Vladimir Diky, Robert D. Chirico, Joseph W. Magee, Ilmutdin Abdulagatov and Michael Frenkel.

                          Thermodynamics Research Center (TRC)
                          Thermophysical Properties Division
                          National Institute of Standards and Technology
                          Boulder CO 80305-3337

                          Questions and comments should be addressed to Dr. Michael Frenkel .

                          DISCLAIMER: The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high-quality copy of the database and to verify that the methods and data contained therein have been selected on the basis of sound scientific judgement. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the program and database.

                          Distributed by:
                          Standard Reference Data Program
                          National Institute of Standards and Technology
                          Gaithersburg MD 20899

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