Methane (data page) Information & Methane (data page) Links at HealthHaven.com

This page provides supplementary chemical data on methane.

[edit] 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.

[edit] Structure and properties

Structure and properties
Index of refraction, n_D	?
Dielectric constant, ε_r	1.7 ε₀ at ? °C
Bond strength	?
Bond length	?
Bond angle	109.5
Magnetic susceptibility	?

[edit] 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, Δ_fusH^o	1.1 kJ/mol
Std entropy change of fusion, Δ_fusS^o	? J/(mol·K)
Std enthalpy change of vaporization, Δ_vapH^o	8.17 kJ/mol
Std entropy change of vaporization, Δ_vapS^o	? J/(mol·K)
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	? kJ/mol
Standard molar entropy, S^o_liquid	? J/(mol K)
Heat capacity, c_p	? J/(mol K)
Gas properties
Std enthalpy change of formation, Δ_fH^o_gas	−74.87 kJ/mol
Standard molar entropy, S^o_gas	188 J/(mol K)
Enthalpy of combustion Δ_cH^o	–882.0 kJ/mol
Heat capacity, c_p	35.69 J/(mol K)
van der Waals' constants^[1]	a = 228.29 L² kPa/mol² b = 0.04278 liter per mole

[edit] 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: $\scriptstyle \log_{10} P_{mmHg} = 6.61184 - \frac {389.93} {266.00 + T}$ given in Lange's Handbook of Chemistry, 10th ed. Note that formula loses accuracy near T_crit = −82.6°C

[edit] Spectral data

Methane infrared spectrum

UV-Vis
λ_max	? 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

[edit] 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.

[lange1522-0] Lange's Handbook of Chemistry, 10th ed, pp 1522-1524

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