title: Chloromethane (data page)
text: # Chloromethane (data page)
  
  This page provides supplementary chemical data on chloromethane.
  
  ## Safety data sheet
  
  The handling of this chemical may incur notable safety precautions. It is highly recommended that you seek the safety data sheet for this chemical from a reliable source such as SIRI, and follow its directions. SDS for chloromethane is available at Supelco Inc
  
  ## Structure and properties
  
  Structure and properties :
  
  | Index of refraction, $n_D$ | 1.3389 |
  | - | - |
  | Abbe number | ? |
  | Dielectric constant, $ε_r$ | 12.9 $ε_0$ at 25 °C |
  | Bond strength | ? |
  | Bond length | ? |
  | Bond angle | ? |
  | Dipole moment | 1.9 D |
  | Magnetic susceptibility | ? |
  | Acentric factor | 0.153 |
  | Critical compressibility | 0.268247 |
  | Compressibility factor | 0.985 |
  | Density | 1002.9 $kg/m^3$ at -24.2 °C (liquid) 2.55 $kg/m^3$ at -24.2 °C (gas) 2.22 $kg/m^3$ at 0 °C (gas) 2.134 $kg/m^3$ at 15 °C (gas) |
  | Surface tension | 19.5 dyn/cm at 0 °C 17.8 dyn/cm at 10 °C 16.2 dyn/cm at 20 °C |
  | Viscosity | 0.2280 mPa·s at 0 °C 0.1784 mPa·s at 20 °C 0.1440 mPa·s at 40 °C |
  | Thermal conductivity | 10.5 mW/(m·K) at 0 °C |
  
  ## Thermodynamic properties
  
  Phase behavior :
  
  | Triple point | 175.43 K (–97.72 °C), 870 Pa |
  | - | - |
  | Critical point | 416 K (143 °C), 6714.4 kPa |
  | Std enthalpy change of fusion, $Δ_{fus}H^o$ | 6.43 kJ/mol |
  | Std entropy change of fusion, $Δ_{fus}S^o$ | 36.66 J/(mol·K) |
  | Std enthalpy change of vaporization, $Δ_{vap}H^o$ | 21.535 kJ/mol at –24.21 °C 20.09 kJ/mol at 20 °C |
  | Std entropy change of vaporization, $Δ_{vap}S^o$ | 86.51 J/(mol·K) at –24.21 °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, $Δ_fH^o_{liquid}$ | –86.37 kJ/mol at 25 °C |
  | Standard molar entropy, $S^o_{liquid}$ | 140.08 J/(mol K) |
  | Heat capacity, $c_p$ | 81.2 J/(mol K) at 15 °C |
  | Gas properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{gas}$ | –83.68 kJ/mol |
  | Standard molar entropy, $S^o_{gas}$ | 234.36 J/(mol K) at 100 kPa |
  | Enthalpy of combustion, $Δ_cH^o_{gas}$ | –764.0 kJ/mol |
  | Heat capacity, $c_p$ | 40.70 J/(mol K) at 25 °C |
  | van der Waals' constants | a = 757.0 $L^2$ $kPa/mol^2$ b = 0.06483 liter per mole |
  
  ## 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 | — | –92.4 | –76.0 | –63.0 | –38.0 | –24.0 | –6.4 | 22.0 | 47.3 | 77.3 | 113.8 | 137.5 |
  
  Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.
  
  ## 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 | |
  