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 (SDS) 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,[1] nD 1.3389
Abbe number ?
Dielectric constant,[2] εr 12.9 ε0 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 [3] 1002.9 kg/m3 at -24.2 °C (liquid)
2.55 kg/m3 at -24.2 °C (gas)
2.22 kg/m3 at 0 °C (gas)
2.134 kg/m3 at 15 °C (gas)
Surface tension[4] 19.5 dyn/cm at 0°C
17.8 dyn/cm at 10°C
16.2 dyn/cm at 20°C
Viscosity[5] 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
, ΔfusHo
6.43 kJ/mol
Std entropy change
of fusion
, ΔfusSo
36.66 J/(mol·K)
Std enthalpy change
of vaporization
, ΔvapHo
21.535 kJ/mol at –24.21°C
20.09 kJ/mol at 20°C
Std entropy change
of vaporization
, ΔvapSo
86.51 J/(mol·K) at –24.21°C
Solid properties
Std enthalpy change
of formation
, ΔfHosolid
? kJ/mol
Standard molar entropy,
? J/(mol K)
Heat capacity, cp ? J/(mol K)
Liquid properties
Std enthalpy change
of formation
, ΔfHoliquid
–86.37 kJ/mol at 25°C
Standard molar entropy,
140.08 J/(mol K)
Heat capacity, cp 81.2 J/(mol K) at 15°C
Gas properties
Std enthalpy change
of formation
, ΔfHogas
–83.68 kJ/mol
Standard molar entropy,
234.36 J/(mol K) at 100 kPa
Enthalpy of combustion, ΔcHogas –764.0 kJ/mol
Heat capacity, cp 40.70 J/(mol K) at 25°C
van der Waals' constants[6] a = 757.0 L2 kPa/mol2
b = 0.06483 liter per mole

Vapor pressure of liquid

P in mm Hg11040100400760152038007600152003040045600
T in °C –92.4–76.0–63.0–38.0–24.0–6.422.047.377.3113.8137.5

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.

Spectral data

λmax ? nm
Extinction coefficient, ε ?
Major absorption bands ? cm1
Proton NMR  
Carbon-13 NMR  
Other NMR data  
Masses of
main fragments


  1. "Methyl Chloride". Inchem. Retrieved 30 May 2007.
  2. "Dielectric Constants Chart". ASI Instruments. Archived from the original on 29 May 2007. Retrieved 30 May 2007.
  3. Air Liquide Gas Encyclopedia
  4. Lange's Handbook of Chemistry, 10th ed. pp 1661-1663
  5. "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. Retrieved 30 May 2007.
  6. Lange's Handbook of Chemistry 10th ed, pp 1522-1524

Except where noted otherwise, data relate to standard ambient temperature and pressure.

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