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Methane (data page)




This page provides supplementary chemical data on methane.

Contents

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, nD  ?
Dielectric constant, εr  ? ε0 at ? °C
Bond strength  ?
Bond length  ?
Bond angle 109.5
Magnetic susceptibility  ?

Thermodynamic properties

Phase behavior
Triple point 90.67 K (−182.48 °C), 0.117 bar
Critical point 190.6 K (−82.6 °C), 46 bar
Std enthalpy change
of fusion, ΔfusHo 		1.1 kJ/mol
Std entropy change
of fusion, ΔfusSo 		 ? J/(mol·K)
Std enthalpy change
of vaporization, ΔvapHo 		8.17 kJ/mol
Std entropy change
of vaporization, ΔvapSo 		 ? J/(mol·K)
Solid properties
Std enthalpy change
of formation, ΔfHosolid 		 ? kJ/mol
Standard molar entropy,
Sosolid 		 ? J/(mol K)
Heat capacity, cp  ? J/(mol K)
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid 		 ? kJ/mol
Standard molar entropy,
Soliquid 		 ? J/(mol K)
Heat capacity, cp  ? J/(mol K)
Gas properties
Std enthalpy change
of formation, ΔfHogas 		−74.87 kJ/mol
Standard molar entropy,
Sogas 		188 J/(mol K)
Enthalpy of combustion ΔcHo –882.0 kJ/mol
Heat capacity, cp 35.69 J/(mol K)
van der Waals' constants[1] a = 228.29 L2 kPa/mol2
b = 0.04278 liter per mole

Vapor pressure of liquid

P in mm Hg 1 10 40 100 400 760 1520 3800 7600 15200 30400 45600
T in °C –205.9(s) –195.5(s) –187.7(s) –181.4 –168.8 –161.5 –152.3 –138.3 –124.8 –108.5 –86.3   —

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed. Annotation "(s)" indicates equilibrium temperature of vapor over solid. Otherwise temperature is equilibrium of vapor over liquid.

 

Spectral data

 

UV-Vis
λmax  ? nm
Extinction coefficient, ε  ?
IR
Major absorption bands ~3300 cm−1
~1300
NMR
Proton NMR  
Carbon-13 NMR  
Other NMR data  
MS
Masses of
main fragments 		 

References

  1. ^ Lange's Handbook of Chemistry, 10th ed, pp 1522-1524

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

Disclaimer applies.

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Methane_(data_page)". A list of authors is available in Wikipedia.
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