Chemical Properties of Methane (CAS 74-82-8)

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InChI

InChI=1S/CH4/h1H4

InChI Key

VNWKTOKETHGBQD-UHFFFAOYSA-N

Formula

CH4

SMILES

C

Molecular Weight¹

16.04

CAS

74-82-8

Other Names

• Biogas
• CH4
• Fire Damp
• Marsh gas
• Methyl hydride
• R 50
• R 50 (refrigerant)

Sources

• NIST Webbook
• Crippen Method

• PAff: Proton affinity (kJ/mol).
• BasG: Gas basicity (kJ/mol).
• Δ_cH°_gas: Standard gas enthalpy of combustion (kJ/mol).
• C_p,gas: Ideal gas heat capacity (J/mol×K).
• Δ_fH°_gas: Enthalpy of formation at standard conditions (kJ/mol).
• Δ_fusH: Enthalpy of fusion at a given temperature (kJ/mol).
• Δ_subH: Enthalpy of sublimation at a given temperature (kJ/mol).
• Δ_vapH: Enthalpy of vaporization at a given temperature (kJ/mol).
• IE: Ionization energy (eV).
• logP_oct/wat: Octanol/Water partition coefficient.
• P_c: Critical Pressure (kPa).
• P_triple: Triple Point Pressure (kPa).
• S°_gas: Molar entropy at standard conditions (J/mol×K).
• Δ_vapS: Entropy of vaporization at a given temperature (J/mol×K).
• T_boil: Normal Boiling Point Temperature (K).
• T_c: Critical Temperature (K).
• T_fus: Normal melting (fusion) point (K).
• T_triple: Triple Point Temperature (K).
• V_c: Critical Volume (m³/kg-mol).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
PAff	543.50	kJ/mol	NIST
BasG	520.60	kJ/mol	NIST
ΔcH°gas	[-891.80; -890.16]	kJ/mol
ΔcH°gas	-890.70 ± 0.40	kJ/mol	NIST
ΔcH°gas	-890.35 ± 0.30	kJ/mol	NIST
ΔcH°gas	-891.80 ± 1.10	kJ/mol	NIST
ΔcH°gas	-890.16 ± 0.30	kJ/mol	NIST
ΔfH°gas	[-74.85; -73.40]	kJ/mol
ΔfH°gas	-74.60 ± 0.30	kJ/mol	NIST
ΔfH°gas	-74.50 ± 0.40	kJ/mol	NIST
ΔfH°gas	-74.85 ± 0.31	kJ/mol	NIST
ΔfH°gas	-73.40 ± 1.10	kJ/mol	NIST
IE	[12.51; 13.60]	eV
IE	12.61 ± 0.01	eV	NIST
IE	12.61 ± 0.01	eV	NIST
IE	12.60 ± 0.40	eV	NIST
IE	12.63 ± 0.02	eV	NIST
IE	Outlier 13.60	eV	NIST
IE	12.75 ± 0.02	eV	NIST
IE	12.82 ± 0.02	eV	NIST
IE	12.60	eV	NIST
IE	12.60	eV	NIST
IE	12.80	eV	NIST
IE	12.64	eV	NIST
IE	12.94 ± 0.04	eV	NIST
IE	12.51	eV	NIST
IE	12.51	eV	NIST
IE	12.62 ± 0.01	eV	NIST
IE	12.78	eV	NIST
IE	12.75	eV	NIST
IE	12.70	eV	NIST
IE	12.99 ± 0.05	eV	NIST
IE	12.75 ± 0.05	eV	NIST
IE	12.90	eV	NIST
IE	12.70	eV	NIST
IE	12.55 ± 0.05	eV	NIST
IE	12.70 ± 0.01	eV	NIST
IE	12.71 ± 0.02	eV	NIST
IE	13.00 ± 0.02	eV	NIST
IE	Outlier 13.60	eV	NIST
IE	Outlier 13.60 ± 0.10	eV	NIST
IE	Outlier 13.60	eV	NIST
logPoct/wat	0.636		Crippen Calculated Property
Pc	[4399.20; 5760.00]	kPa
Pc	4599.00 ± 3.00	kPa	NIST
Pc	4595.00 ± 10.00	kPa	NIST
Pc	4599.20 ± 3.00	kPa	NIST
Pc	4604.00	kPa	NIST
Pc	4597.97 ± 0.10	kPa	NIST
Pc	4399.20 ± 2.00	kPa	NIST
Pc	4620.00 ± 40.00	kPa	NIST
Pc	4595.00 ± 2.00	kPa	NIST
Pc	4598.83	kPa	NIST
Pc	4595.70 ± 0.45	kPa	NIST
Pc	4626.00 ± 34.47	kPa	NIST
Pc	4620.00 ± 15.19	kPa	NIST
Pc	4608.00 ± 34.47	kPa	NIST
Pc	4630.00 ± 101.33	kPa	NIST
Pc	4640.00 ± 101.33	kPa	NIST
Pc	4620.42 ± 30.39	kPa	NIST
Pc	4620.00 ± 40.53	kPa	NIST
Pc	Outlier 5560.00 ± 1013.20	kPa	NIST
Pc	5070.00 ± 405.30	kPa	NIST
Pc	Outlier 5760.00 ± 1013.20	kPa	NIST
Pc	4740.00 ± 202.65	kPa	NIST
Ptriple	[9.30; 12.26]	kPa
Ptriple	11.69 ± 0.00	kPa	NIST
Ptriple	11.74 ± 0.01	kPa	NIST
Ptriple	11.69 ± 0.00	kPa	NIST
Ptriple	11.68 ± 0.06	kPa	NIST
Ptriple	11.74	kPa	NIST
Ptriple	11.74 ± 0.04	kPa	NIST
Ptriple	11.69 ± 0.00	kPa	NIST
Ptriple	11.65 ± 0.50	kPa	NIST
Ptriple	11.66 ± 0.02	kPa	NIST
Ptriple	11.67 ± 0.01	kPa	NIST
Ptriple	11.68 ± 0.01	kPa	NIST
Ptriple	11.69 ± 0.01	kPa	NIST
Ptriple	11.71 ± 0.01	kPa	NIST
Ptriple	11.66 ± 0.01	kPa	NIST
Ptriple	11.71 ± 0.01	kPa	NIST
Ptriple	11.67 ± 0.02	kPa	NIST
Ptriple	11.65	kPa	NIST
Ptriple	11.68 ± 0.01	kPa	NIST
Ptriple	11.74 ± 0.01	kPa	NIST
Ptriple	11.63 ± 0.13	kPa	NIST
Ptriple	Outlier 9.30 ± 0.26	kPa	NIST
Ptriple	12.26 ± 0.26	kPa	NIST
Ptriple	10.66	kPa	NIST
S°gas	188.66 ± 0.42	J/mol×K	NIST
Tboil	[109.20; 112.00]	K
Tboil	111.70	K	NIST
Tboil	111.65 ± 0.00	K	NIST
Tboil	111.60 ± 0.20	K	NIST
Tboil	111.70	K	NIST
Tboil	111.70 ± 0.30	K	NIST
Tboil	111.65	K	NIST
Tboil	111.65 ± 0.07	K	NIST
Tboil	112.00 ± 0.50	K	NIST
Tboil	112.00 ± 0.50	K	NIST
Tboil	112.00 ± 0.50	K	NIST
Tboil	111.50 ± 0.50	K	NIST
Tboil	110.20 ± 1.00	K	NIST
Tboil	Outlier 109.20 ± 1.00	K	NIST
Tc	[173.70; 199.70]	K
Tc	190.56 ± 0.01	K	NIST
Tc	190.55 ± 0.01	K	NIST
Tc	190.58	K	NIST
Tc	190.53 ± 0.05	K	NIST
Tc	190.55 ± 0.01	K	NIST
Tc	190.60	K	NIST
Tc	190.78 ± 0.40	K	NIST
Tc	190.55 ± 0.05	K	NIST
Tc	190.55	K	NIST
Tc	190.53 ± 0.00	K	NIST
Tc	190.78 ± 0.40	K	NIST
Tc	190.57 ± 0.10	K	NIST
Tc	190.60 ± 0.15	K	NIST
Tc	190.30 ± 0.40	K	NIST
Tc	190.59 ± 0.40	K	NIST
Tc	190.70 ± 0.40	K	NIST
Tc	191.07 ± 0.60	K	NIST
Tc	190.30 ± 0.50	K	NIST
Tc	190.30 ± 0.60	K	NIST
Tc	191.40 ± 1.00	K	NIST
Tc	Outlier 173.70 ± 20.00	K	NIST
Tc	Outlier 199.70 ± 10.00	K	NIST
Tc	197.50 ± 7.00	K	NIST
Tfus	[85.70; 91.20]	K
Tfus	85.70 ± 0.20	K	NIST
Tfus	90.60 ± 0.30	K	NIST
Tfus	91.20 ± 2.00	K	NIST
Tfus	90.60 ± 0.20	K	NIST
Tfus	90.50 ± 0.20	K	NIST
Ttriple	[87.40; 90.80]	K
Ttriple	90.68 ± 0.00	K	NIST
Ttriple	90.68 ± 0.02	K	NIST
Ttriple	90.68 ± 0.01	K	NIST
Ttriple	90.68 ± 0.01	K	NIST
Ttriple	90.67 ± 0.01	K	NIST
Ttriple	90.68 ± 0.01	K	NIST
Ttriple	90.67 ± 0.02	K	NIST
Ttriple	90.68 ± 0.03	K	NIST
Ttriple	90.68 ± 0.02	K	NIST
Ttriple	90.68 ± 0.00	K	NIST
Ttriple	90.67 ± 0.01	K	NIST
Ttriple	90.66 ± 0.05	K	NIST
Ttriple	Outlier 88.65 ± 0.20	K	NIST
Ttriple	90.64 ± 0.05	K	NIST
Ttriple	90.66 ± 0.06	K	NIST
Ttriple	90.67 ± 0.01	K	NIST
Ttriple	90.67	K	NIST
Ttriple	90.64 ± 0.05	K	NIST
Ttriple	90.67 ± 0.02	K	NIST
Ttriple	90.66 ± 0.01	K	NIST
Ttriple	90.67 ± 0.03	K	NIST
Ttriple	90.66 ± 0.02	K	NIST
Ttriple	90.35 ± 0.50	K	NIST
Ttriple	90.63	K	NIST
Ttriple	90.67 ± 0.10	K	NIST
Ttriple	90.68 ± 0.05	K	NIST
Ttriple	90.65 ± 0.15	K	NIST
Ttriple	90.25 ± 0.15	K	NIST
Ttriple	89.85 ± 0.20	K	NIST
Ttriple	90.00 ± 0.10	K	NIST
Ttriple	90.80 ± 1.00	K	NIST
Ttriple	Outlier 87.40	K	NIST
Vc	0.099	m3/kg-mol	NIST
Vc	0.099	m3/kg-mol	NIST
Vc	0.100 ± 0.001	m3/kg-mol	NIST

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
Cp,gas	34.92 ± 0.25	J/mol×K	279.0	NIST
ΔfusH	0.94	kJ/mol	90.7	NIST
ΔsubH	[9.20; 10.00]	kJ/mol	[63.00; 84.00]
ΔsubH	9.70	kJ/mol	63.0	NIST
ΔsubH	9.70	kJ/mol	72.0	NIST
ΔsubH	9.20	kJ/mol	72.0	NIST
ΔsubH	9.62	kJ/mol	77.5	NIST
ΔsubH	10.00	kJ/mol	84.0	NIST
ΔvapH	[4.00; 8.70]	kJ/mol	[99.00; 180.00]
ΔvapH	8.50 ± 0.10	kJ/mol	99.0	NIST
ΔvapH	8.52	kJ/mol	99.54	NIST
ΔvapH	8.60	kJ/mol	101.0	NIST
ΔvapH	8.60	kJ/mol	105.0	NIST
ΔvapH	8.60	kJ/mol	109.0	NIST
ΔvapH	8.17	kJ/mol	111.7	NIST
ΔvapH	8.20	kJ/mol	112.0	NIST
ΔvapH	7.50	kJ/mol	130.0	NIST
ΔvapH	8.40	kJ/mol	132.0	NIST
ΔvapH	8.10	kJ/mol	137.0	NIST
ΔvapH	8.50	kJ/mol	140.5	NIST
ΔvapH	8.60	kJ/mol	145.0	NIST
ΔvapH	8.50	kJ/mol	149.0	NIST
ΔvapH	5.90	kJ/mol	160.0	NIST
ΔvapH	8.70	kJ/mol	168.5	NIST
ΔvapH	4.00	kJ/mol	180.0	NIST
ΔvapS	85.58	J/mol×K	99.54	NIST

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