This page provides supplementary chemical data on methane.

Material Safety Data Sheet

The handling of this chemical may incur notable safety precautions.Material Safety Datasheet . Iowa State

Structure and properties

Structure and properties Index of refraction, nD 1.000444Haynes, p. 10.256 Dielectric constant, εr 1.6761 ε0 at −182 °CHaynes, p. 6.2121.0008181 ε0 at −20 °CHaynes, p. 6.221 Bond strength ? Bond length 0.10870 nm Haynes, p. 9.45 Bond angle 109.5° Magnetic susceptibility −17.4 cm3/molHaynes, p. 3.578

Thermodynamic properties

Phase behavior Triple point 90.67 K (−182.48 °C), 0.117 bar Critical point 190.6 K (−82.6 °C), 46.0 barHaynes, p. 6.175 Std enthalpy changeof fusion, ΔfusHo 1.1 kJ/mol Std entropy changeof fusion, ΔfusSo 12.1 J/(mol·K) Std enthalpy changeof vaporization, ΔvapHo 8.17 kJ/mol Std entropy changeof vaporization, ΔvapSo ? J/(mol·K) Solid properties Std enthalpy changeof formation, ΔfHosolid ? kJ/mol Standard molar entropy,Sosolid ? J/(mol K) Heat capacity, cp ? J/(mol K) Liquid properties Std enthalpy changeof formation, ΔfHoliquid ? kJ/mol Standard molar entropy,Soliquid ? J/(mol K) Heat capacity, cp ? J/(mol K) Gas properties Std enthalpy changeof formation, ΔfHogas −74.6 kJ/mol Standard molar entropy,Sogas 186.3 J/(mol K) Enthalpy of combustion ΔcHo −802 kJ/molHaynes, p. 5.67 Heat capacity, cp 35.7 J/(mol K)Haynes, p. 5.26 van der Waals' constantsLange's Handbook of Chemistry, 10th ed, pp. 1522–1524. a = 228.29 L2 kPa/mol2 b = 0.04278 L/mol

Vapor pressure of liquid P (mm Hg) 1 10 40 100 400 760 1520 3800 7600 15200 30400 45600 T (°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. Note that these are all negative temperature values.

Spectral data

UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands 3019, 2917, 1534, 1306 cm−1Haynes, p. 9.106 NMR Proton NMR   Carbon-13 NMR −2.3 ppmHaynes, p. 8.67 Other NMR data   MS Masses of main fragments  

References

Cited sources