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
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.
log10 of methane vapor pressure vs. temperature. Uses formula: given in Lange’s Handbook of Chemistry, 10th ed. Note that formula loses accuracy near Tcrit = −82.6°C
Spectral data
Methane infrared spectrum
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
- ^ Lange’s Handbook of Chemistry, 10th ed, pp 1522-1524
Except where noted otherwise, data relate to standard ambient temperature and pressure.
Disclaimer applies.
Retrieved from “http://en.wikipedia.org/wiki/Methane_(data_page)”
Categories: Chemical data pages | Methane
-3D-balls.png){kind=link}
