title: Pentane (data page)
text: # Pentane (data page)
  
  This page provides supplementary chemical data on n-pentane.
  
  ## 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 eChemPortal, and follow its directions.
  
  * Mallinckrodt Baker.
  
  ## Structure and properties
  
  Structure and properties :
  
  | Index of refraction, $n_D$ | 1.3575 at 20 °C |
  | - | - |
  | Abbe number | ? |
  | Dielectric constant, $ε_r$ | 1.844 $ε_0$ at 20 °C |
  | Bond strength | ? |
  | Bond length | ? |
  | Bond angle | ? |
  | Magnetic susceptibility | ? |
  | Surface tension | 18.16 dyn/cm at 0 °C 17.03 dyn/cm at 10 °C 15.82 dyn/cm at 20 °C 14.73 dyn/cm at 30 °C 13.66 dyn/cm at 40 °C |
  | Viscosity | 0.2894 mPa·s at 0 °C 0.2395 mPa·s at 20 °C 0.2200 mPa·s at 30 °C |
  
  ## Thermodynamic properties
  
  Phase behavior :
  
  | Triple point | 143.46 K (–128.69 °C), 0.076 Pa |
  | - | - |
  | Critical point | 469.8 K (196.7 °C), 3360 kPa |
  | Std enthalpy change of fusion, $Δ_{fus}H^o$ | 8.4 kJ/mol |
  | Std entropy change of fusion, $Δ_{fus}S^o$ | 58.5 J/(mol·K) |
  | Std enthalpy change of vaporization, $Δ_{vap}H^o$ | 26.200 kJ/mol at 25 °C 25.79 kJ/mol at 36.1 °C |
  | Std entropy change of vaporization, $Δ_{vap}S^o$ | 87.88 J/(mol·K) at 25 °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, $Δ_fH^o_{liquid}$ | –173.5 kJ/mol |
  | Standard molar entropy, $S^o_{liquid}$ | 263.47 J/(mol K) |
  | Enthalpy of combustion, $Δ_cH^o_{liquid}$ | –3509 kJ/mol |
  | Heat capacity, $c_p$ | 167.19 J/(mol K) at 25 °C |
  | Gas properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{gas}$ | –146.8 kJ/mol |
  | Standard molar entropy, $S^o_{gas}$ | 347.82 J/(mol K) |
  | Enthalpy of combustion, $Δ_cH^o_{gas}$ | –3535 kJ/mol |
  | Heat capacity, $c_p$ | 120.07 J/(mol K) at 25 °C |
  
  ## 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 | –76.6 | –50.1 | –29.2 | –12.6 | 18.5 | 36.1 | 58.0 | 92.4 | 124.7 | 164.3 | — | — |
  
  Table data obtained from CRC Handbook of Chemistry and Physics 47th ed.
  
  ## Spectral data
  
  UV-Vis :
  
  | $λ_{max}$ | ? nm |
  | - | - |
  | Extinction coefficient, ε | ? |
  | IR ||
  | Major absorption bands | 2881, 2940, 2965 $cm^{−1}$ |
  | NMR ||
  | Proton NMR | |
  | Carbon-13 NMR | |
  | Other NMR data | |
  | MS ||
  | Masses of main fragments | |
  
  * view
  * Except where noted otherwise, data relate to Standard temperature and pressure.
  * Reliability of data general note.
  