title: Ethane (data page)
text: # Ethane (data page)
  
  This page provides supplementary chemical data on ethane.
  
  ## Material Safety Data Sheet
  
  The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as SIRI, and follow its directions.
  
  ## Structure and properties
  
  Structure and properties :
  
  | Index of refraction, $n_D$ | ? |
  | - | - |
  | Abbe number | ? |
  | Dielectric constant, $ε_r$ | ? $ε_0$ at ? °C |
  | Bond strength | ? |
  | Bond length | ? |
  | Bond angle | ? |
  | Magnetic susceptibility | ? |
  | Surface tension | 21.16 dyn/cm at −119.9 °C |
  
  ## Thermodynamic properties
  
  Phase behavior :
  
  | Triple point | 91 K (−182 °C), 1.1 Pa |
  | - | - |
  | Critical point | 305.3 K (32.2 °C), 4.9 MPa |
  | Std enthalpy change of fusion, $Δ_{fus}H^o$ | 9.76 kJ/mol at −182 °C |
  | Std entropy change of fusion, $Δ_{fus}S^o$ | 6.46 J/(mol·K) at −182 °C |
  | Std enthalpy change of vaporization, $Δ_{vap}H^o$ crystal I → liquid | 14.703 kJ/mol at −89.0 °C |
  | Std entropy change of vaporization, $Δ_{vap}S^o$ crystal I → liquid | 79.87 J/(mol·K) at −89.0 °C |
  | Std enthalpy change of state transition, $Δ_{trs}H^o$ crystal II → crystal I | 2.282 kJ/mol at −183.3 °C |
  | Std entropy change of state transition, $Δ_{trs}S^o$ crystal II → crystal I | 25.48 kJ/mol at −183.3 °C |
  | Solid properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{solid}$ | ? kJ/mol |
  | Standard molar entropy, $S^o_{solid}$ | ? J/(mol K) |
  | Heat capacity, $c_p$ | ? J/(mol K) |
  | Liquid properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{liquid}$ | ? kJ/mol |
  | Standard molar entropy, $S^o_{liquid}$ | 126.7 J/(mol K) |
  | Heat capacity, $c_p$ | 68.5 J/(mol K) at −179 °C |
  | Gas properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{gas}$ | −83.8 kJ/mol |
  | Standard molar entropy, $S^o_{gas}$ | 229.6 J/(mol K) |
  | Enthalpy of combustion, $Δ_cH^o$ | −1560.7 kJ/mol |
  | Heat capacity, $c_p$ | 52.49 J/(mol K) at 25 °C |
  | van der Waals' constants | a = 556.2 $L^2$ $kPa/mol^2$ b = 0.06380 L/mol |
  
  ## Vapor pressure of liquid
  
  | P in mm Hg | P in mm Hg | 1 | 10 | 40 | 100 | 400 | 760 | 1520 | 3800 | 7600 | 15200 | 30400 | 45600 |
  | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
  | T in °C | T in °C | −159.5 | −142.9 | −129.8 | −119.3 | −99.6 | −88.6 | −75.0 | −52.8 | −32.0 | −6.4 | 23.6 | — |
  
  Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.
  
  ## Melting point data
  
  Mean value for acceptable data: −183.01 °C (90.14 K).
  
  Sources used, from ONS Open Melting Point Collection:
  
  * −183.33 °C
  * −182.85 °C from CHERIC
  * −182.78 °C
  * −182.79 °C from PHYSPROP
  * −183.28 °C
  
  Values considered "outliers", not included in averaging:
  
  * −172 °C from Oxford MSDS
  * −172.15 °C
  
  ## Spectral data
  
  UV-Vis :
  
  | $λ_{max}$ | ? nm |
  | - | - |
  | Extinction coefficient, ε | ? |
  | IR ||
  | Major absorption bands | ? $cm^{−1}$ |
  | NMR ||
  | Proton NMR | |
  | Carbon-13 NMR | |
  | Other NMR data | |
  | MS ||
  | Masses of main fragments | |
  