Compound Information 

Name: pentafluoroethane
Formula: C2HF5
Molar Mass: 120.022016
Additional Names: 1,1,1,2,2-pentafluoroethane
R-125
freon 125
ethane, pentafluoro-
Image of pentafluoroethane

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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 (Crystal 1, Liquid, and Gas)
    3 experimental data points
    • Normal boiling temperature (Liquid and Gas)
      • Critical temperature (Liquid and Gas)
        14 experimental data points
        • Critical pressure (Liquid and Gas)
          11 experimental data points
          • Boiling temperature (Liquid in equilibrium with Gas) as a function of Pressure
            Pressure from 2.96844 kPa to 3617.7 kPa
            • Phase boundary pressure (Liquid in equilibrium with Gas) as a function of Temperature
              Temperature from 172.52 K to 339.173 K
              50 experimental data points
              • Critical density (Liquid and Gas)
                8 experimental data points
                • Density
                  • Density (Liquid in equilibrium with Gas) as a function of Temperature
                    Temperature from 172.52 K to 339.173 K
                    50 experimental data points
                  • Density (Gas in equilibrium with Liquid) as a function of Temperature
                    Temperature from 172.52 K to 339.173 K
                    34 experimental data points
                  • Density (Gas) as a function of Temperature and Pressure
                    Temperature from 172.52 K to 500 K
                    Pressure from 0.06 kPa to 3618 kPa
                    47 experimental data points
                  • Density (Liquid) as a function of Temperature and Pressure
                    Temperature from 172.52 K to 339.18 K
                    Pressure from 0.06 kPa to 60000 kPa
                    50 experimental data points
                • Isobaric coefficient of expansion
                  • Isobaric coefficient of expansion (Liquid) as a function of Temperature and Pressure
                    Temperature from 172.52 K to 339.18 K
                    Pressure from 0.06 kPa to 60000 kPa
                  • Isobaric coefficient of expansion (Gas) as a function of Temperature and Pressure
                    Temperature from 172.52 K to 500 K
                    Pressure from 0.06 kPa to 3618 kPa
                • Isothermal compressibility
                  • Isothermal compressibility (Liquid) as a function of Temperature and Pressure
                    Temperature from 172.52 K to 339.18 K
                    Pressure from 0.06 kPa to 60000 kPa
                  • Isothermal compressibility (Gas) as a function of Temperature and Pressure
                    Temperature from 172.52 K to 500 K
                    Pressure from 0.06 kPa to 3618 kPa
                • Thermal pressure coefficient
                  • Thermal pressure coefficient (Liquid) as a function of Temperature and Pressure
                    Temperature from 172.52 K to 339.18 K
                    Pressure from 0.06 kPa to 60000 kPa
                  • Thermal pressure coefficient (Gas) as a function of Temperature and Pressure
                    Temperature from 172.52 K to 500 K
                    Pressure from 0.06 kPa to 3618 kPa
                • 2nd virial coefficient (Gas) as a function of Temperature
                  Temperature from 172.52 K to 500 K
                  49 experimental data points
                  • 3rd virial coefficient (Gas) as a function of Temperature
                    Temperature from 172.52 K to 500 K
                    34 experimental data points
                    • Enthalpy of phase transition (Crystal 1 to Liquid in equilibrium with Gas)
                      1 experimental data points
                      • Enthalpy of vaporization or sublimation (Liquid to Gas) as a function of Temperature
                        Temperature from 172.52 K to 339.173 K
                        6 experimental data points
                        • Heat capacity at saturation pressure (Liquid in equilibrium with Gas) as a function of Temperature
                          Temperature from 172.52 K to 339 K
                          50 experimental data points
                          • Heat capacity at constant pressure
                            • Heat capacity at constant pressure (Liquid) as a function of Temperature and Pressure
                              Temperature from 172.52 K to 339.18 K
                              Pressure from 0.06 kPa to 60000 kPa
                              50 experimental data points
                            • Heat capacity at constant pressure (Ideal Gas) as a function of Temperature
                              Temperature from 50 K to 3000 K
                            • Heat capacity at constant pressure (Gas) as a function of Temperature and Pressure
                              Temperature from 172.52 K to 500 K
                              Pressure from 0.06 kPa to 3618 kPa
                              9 experimental data points
                          • Enthalpy
                            • Enthalpy (Liquid in equilibrium with Gas) as a function of Temperature
                              Temperature from 172.72 K to 318 K
                            • Enthalpy (Ideal Gas) as a function of Temperature
                              Temperature from 50 K to 3000 K
                          • Entropy
                            • Entropy (Ideal Gas) as a function of Temperature and Pressure
                              Temperature from 50 K to 3000 K
                            • Entropy (Liquid in equilibrium with Gas) as a function of Temperature
                              Temperature from 172.52 K to 339.173 K
                          • Adiabatic compressibility
                            • Adiabatic compressibility (Liquid) as a function of Temperature and Pressure
                              Temperature from 172.52 K to 339.18 K
                              Pressure from 0.06 kPa to 60000 kPa
                            • Adiabatic compressibility (Gas) as a function of Temperature and Pressure
                              Temperature from 172.52 K to 500 K
                              Pressure from 0.06 kPa to 3618 kPa
                          • Pressure coefficient of enthalpy (Liquid) as a function of Temperature and Pressure
                            Temperature from 172.52 K to 339.18 K
                            Pressure from 0.06 kPa to 60000 kPa
                            • Joule-Thomson coefficient (Gas) as a function of Temperature and Pressure
                              Temperature from 172.52 K to 500 K
                              Pressure from 0.06 kPa to 3618 kPa
                              • Speed of sound
                                • Speed of sound (Liquid in equilibrium with Gas) as a function of Temperature
                                  Temperature from 172.52 K to 339.173 K
                                  15 experimental data points
                                • Speed of sound (Gas in equilibrium with Liquid) as a function of Temperature
                                  Temperature from 172.52 K to 339.173 K
                                  9 experimental data points
                                • Speed of sound (Gas) as a function of Temperature and Pressure
                                  Temperature from 172.52 K to 500 K
                                  Pressure from 0.06 kPa to 3618 kPa
                                  50 experimental data points
                                • Speed of sound (Liquid) as a function of Temperature and Pressure
                                  Temperature from 172.52 K to 339.18 K
                                  Pressure from 0.06 kPa to 60000 kPa
                                  50 experimental data points
                              • Refractive index (Liquid) as a function of Wavelength, Temperature, and Pressure
                                45 experimental data points
                                • Surface tension (Liquid in equilibrium with Gas) as a function of Temperature
                                  Temperature from 172.52 K to 339.173 K
                                  50 experimental data points
                                  • Viscosity
                                    • Viscosity (Liquid) as a function of Temperature and Pressure
                                      Temperature from 172.52 K to 339.177 K
                                      Pressure from 0.06 kPa to 60000 kPa
                                      50 experimental data points
                                    • Viscosity (Liquid in equilibrium with Gas) as a function of Temperature
                                      Temperature from 172.52 K to 339 K
                                      50 experimental data points
                                    • Viscosity (Gas) as a function of Temperature and Pressure
                                      Temperature from 172.52 K to 500 K
                                      Pressure from 0.06 kPa to 3618 kPa
                                      46 experimental data points
                                  • Thermal conductivity
                                    • Thermal conductivity (Liquid in equilibrium with Gas) as a function of Temperature
                                      Temperature from 172.52 K to 339 K
                                      43 experimental data points
                                    • Thermal conductivity (Liquid) as a function of Temperature and Pressure
                                      Temperature from 172.52 K to 339.177 K
                                      Pressure from 0.06 kPa to 60000 kPa
                                      811 experimental data points
                                    • Thermal conductivity (Gas) as a function of Temperature and Pressure
                                      Temperature from 172.52 K to 500 K
                                      Pressure from 0.06 kPa to 3618 kPa
                                      50 experimental data points

                                  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:
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                                  National Institute of Standards and Technology
                                  Gaithersburg MD 20899

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