Chemical Properties of Acetylene (CAS 74-86-2)

InChI

InChI=1S/C2H2/c1-2/h1-2H

InChI Key

HSFWRNGVRCDJHI-UHFFFAOYSA-N

Formula

C2H2

SMILES

C#C

Molecular Weight¹

26.04

CAS

74-86-2

Other Names

• ACETYLEN
• C2H2
• ETHYNE
• Ethine
• NARCYLEN
• UN 1001
• Vinylene

• ω : Acentric Factor.
• PAff : Proton affinity (kJ/mol).
• T_ig : Autoignition Temperature (K).
• BasG : Gas basicity (kJ/mol).
• C_p,gas : Ideal gas heat capacity (J/mol×K).
• μ : Dipole Moment (debye).
• LFL : Lower Flammability Limit (% in Air).
• UFL : Upper Flammability Limit (% in Air).
• Δ_fG° : Standard Gibbs free energy of formation (kJ/mol).
• R_g : Radius of Gyration.
• Δ_fH°_gas : Enthalpy of formation at standard conditions (kJ/mol).
• Δ_fusH° : Enthalpy of fusion 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 standard conditions (kJ/mol).
• Δ_vapH : Enthalpy of vaporization at a given temperature (kJ/mol).
• IE : Ionization energy (eV).
• log₁₀WS : Log10 of Water solubility in mol/l.
• logP_oct/wat : Octanol/Water partition coefficient.
• McVol : McGowan's characteristic volume (ml/mol).
• NFPA Fire : NFPA Fire Rating.
• NFPA Health : NFPA Health Rating.
• NFPA Safety : NFPA Safety Rating.
• P_c : Critical Pressure (kPa).
• P_triple : Triple Point Pressure (kPa).
• P_vap : Vapor pressure (kPa).
• ρ_c : Critical density (kg/m³).
• ρ_l : Liquid Density (kg/m³).
• I_np : Non-polar retention indices.
• Δ_fusS : Entropy of fusion at a given temperature (J/mol×K).
• γ : Surface Tension (N/m).
• 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/kmol).
• Z_c : Critical Compressibility.
• Z_ra : Rackett Parameter.
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
ω	0.1900		KDB
PAff	641.40	kJ/mol	NIST
Tig	578.15	K	KDB
BasG	616.70	kJ/mol	NIST
μ	0.00	debye	KDB
LFL	2.50	% in Air	KDB
UFL	80.00	% in Air	KDB
ΔfG°	209.30	kJ/mol	KDB
Rg	1.0950		KDB
ΔfH°gas	[226.70; 227.40]	kJ/mol
ΔfH°gas	226.90	kJ/mol	KDB
ΔfH°gas	227.40 ± 0.80	kJ/mol	NIST
ΔfH°gas	226.70 ± 0.79	kJ/mol	NIST
ΔfusH°	3.76	kJ/mol	Joback Calculated Property
ΔvapH°	17.61	kJ/mol	Joback Calculated Property
IE	[11.20; 11.49]	eV
IE	11.40 ± 0.00	eV	NIST
IE	11.41 ± 0.01	eV	NIST
IE	11.40	eV	NIST
IE	11.40	eV	NIST
IE	11.40	eV	NIST
IE	11.40	eV	NIST
IE	11.40 ± 0.10	eV	NIST
IE	11.40 ± 0.10	eV	NIST
IE	11.40 ± 0.02	eV	NIST
IE	Outlier 11.30	eV	NIST
IE	11.37 ± 0.05	eV	NIST
IE	11.40 ± 0.00	eV	NIST
IE	11.39 ± 0.01	eV	NIST
IE	11.40 ± 0.01	eV	NIST
IE	11.40	eV	NIST
IE	11.39 ± 0.02	eV	NIST
IE	11.39 ± 0.01	eV	NIST
IE	11.39 ± 0.05	eV	NIST
IE	11.41 ± 0.01	eV	NIST
IE	11.40 ± 0.01	eV	NIST
IE	11.40 ± 0.01	eV	NIST
IE	11.40 ± 0.00	eV	NIST
IE	11.40 ± 0.02	eV	NIST
IE	11.41 ± 0.01	eV	NIST
IE	11.41 ± 0.01	eV	NIST
IE	Outlier 11.20 ± 0.10	eV	NIST
IE	11.41	eV	NIST
IE	Outlier 11.49	eV	NIST
IE	11.43	eV	NIST
log10WS	[0.29; 0.29]
log10WS	0.29		Aq. Sol...
log10WS	0.29		Estimat...
logPoct/wat	0.249		Crippen Calculated Property
McVol	30.440	ml/mol	McGowan Calculated Property
NFPA Fire	4		KDB
NFPA Health	1		KDB
NFPA Safety	3		KDB
Pc	[6138.00; 6138.00]	kPa
Pc	6138.00	kPa	KDB
Pc	6138.00 ± 10.00	kPa	NIST
Ptriple	128.25 ± 0.39	kPa	NIST
ρc	231.99 ± 0.26	kg/m3	NIST
Inp	[155.00; 195.00]
Inp	155.00		NIST
Inp	157.00		NIST
Inp	156.00		NIST
Inp	156.00		NIST
Inp	Outlier 195.00		NIST
Inp	182.00		NIST
Inp	176.00		NIST
Inp	156.00		NIST
Inp	182.00		NIST
Inp	155.00		NIST
Inp	165.00		NIST
Inp	165.00		NIST
Tboil	[188.43; 189.60]	K
Tboil	188.43	K	KDB
Tboil	189.00	K	NIST
Tboil	189.60 ± 0.30	K	NIST
Tc	[308.30; 309.70]	K
Tc	308.30	K	KDB
Tc	308.30 ± 0.10	K	NIST
Tc	308.35	K	NIST
Tc	308.66	K	NIST
Tc	309.70 ± 0.60	K	NIST
Tfus	[171.65; 192.40]	K
Tfus	192.40	K	KDB
Tfus	192.40	K	Aq. Sol...
Tfus	171.65 ± 0.50	K	NIST
Tfus	191.40 ± 1.00	K	NIST
Tfus	191.65 ± 0.50	K	NIST
Ttriple	[191.35; 192.40]	K
Ttriple	192.40 ± 0.50	K	NIST
Ttriple	191.35 ± 0.30	K	NIST
Vc	[0.112; 0.113]	m3/kmol
Vc	0.112	m3/kmol	KDB
Vc	0.112	m3/kmol	NIST
Vc	0.113	m3/kmol	NIST
Zc	0.2686640		KDB
Zra	0.27		KDB

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
Cp,gas	[37.58; 48.98]	J/mol×K	[216.40; 367.29]
Cp,gas	37.58	J/mol×K	216.40	Joback Calculated Property
Cp,gas	39.83	J/mol×K	241.55	Joback Calculated Property
Cp,gas	41.94	J/mol×K	266.70	Joback Calculated Property
Cp,gas	43.90	J/mol×K	291.84	Joback Calculated Property
Cp,gas	45.72	J/mol×K	316.99	Joback Calculated Property
Cp,gas	47.41	J/mol×K	342.14	Joback Calculated Property
Cp,gas	48.98	J/mol×K	367.29	Joback Calculated Property
ΔfusH	[2.54; 3.76]	kJ/mol	[142.70; 192.40]
ΔfusH	2.54	kJ/mol	142.70	NIST
ΔfusH	3.76	kJ/mol	192.40	NIST
ΔfusH	3.76	kJ/mol	192.40	NIST
ΔsubH	[21.80; 25.20]	kJ/mol	[121.50; 172.00]
ΔsubH	23.50	kJ/mol	121.50	NIST
ΔsubH	22.10	kJ/mol	129.00	NIST
ΔsubH	22.70	kJ/mol	159.50	NIST
ΔsubH	21.80	kJ/mol	162.00	NIST
ΔsubH	25.20	kJ/mol	172.00	NIST
ΔvapH	[16.30; 17.00]	kJ/mol	[192.40; 283.00]
ΔvapH	16.67	kJ/mol	192.40	KDB
ΔvapH	16.80	kJ/mol	200.00	NIST
ΔvapH	16.70	kJ/mol	208.50	NIST
ΔvapH	17.00	kJ/mol	214.00	NIST
ΔvapH	16.70	kJ/mol	250.00	NIST
ΔvapH	16.40	kJ/mol	261.50	NIST
ΔvapH	16.30	kJ/mol	283.00	NIST
ρl	615.00	kg/m3	189.00	KDB
ΔfusS	[17.80; 19.50]	J/mol×K	[142.70; 192.40]
ΔfusS	17.80	J/mol×K	142.70	NIST
ΔfusS	19.50	J/mol×K	192.40	NIST
γ	0.02	N/m	203.20	KDB

Correlations

Property	Value	Unit	Temperature (K)	Source
Pvap	[1.33; 5425.42]	kPa	[144.63; 268.30]	The Yaw...
Equation			ln(Pvp) = A + B/(T + C)
Coefficient A			1.76267e+01
Coefficient B			-2.32926e+03
Coefficient C			-1.02910e+01
Temperature range, min.			144.63
Temperature range, max.			268.30
Pvap	1.33	kPa	144.63	Calculated Property
Pvap	6.67	kPa	158.37	Calculated Property
Pvap	25.35	kPa	172.11	Calculated Property
Pvap	78.20	kPa	185.85	Calculated Property
Pvap	204.86	kPa	199.59	Calculated Property
Pvap	471.07	kPa	213.34	Calculated Property
Pvap	974.72	kPa	227.08	Calculated Property
Pvap	1849.37	kPa	240.82	Calculated Property
Pvap	3264.95	kPa	254.56	Calculated Property
Pvap	5425.42	kPa	268.30	Calculated Property
Pvap	[104.13; 6143.68]	kPa	[189.00; 308.32]	KDB Vap...
Equation			ln(Pvp) = A + B/T + C*ln(T) + D*T^2
Coefficient A			7.88347e+01
Coefficient B			-3.71141e+03
Coefficient C			-1.05984e+01
Coefficient D			2.80537e-05
Temperature range, min.			189.00
Temperature range, max.			308.32
Pvap	104.13	kPa	189.00	Calculated Property
Pvap	212.69	kPa	202.26	Calculated Property
Pvap	391.96	kPa	215.52	Calculated Property
Pvap	666.26	kPa	228.77	Calculated Property
Pvap	1062.50	kPa	242.03	Calculated Property
Pvap	1610.82	kPa	255.29	Calculated Property
Pvap	2346.01	kPa	268.55	Calculated Property
Pvap	3309.76	kPa	281.80	Calculated Property
Pvap	4553.77	kPa	295.06	Calculated Property
Pvap	6143.68	kPa	308.32	Calculated Property

Similar Compounds

Find more compounds similar to Acetylene.

Mixtures

• Acetylene + Ethanol, 2,2'-oxybis-
• Acetylene + 1,2-Ethanediol
• Acetylene + Isopropyl Alcohol
• Acetylene + 1-Propanol, 2-methyl-
• Acetylene + 1-Butanol
• Acetylene + 1,4-Butanediol
• Acetylene + Linalool
• Acetylene + 2-Pyrrolidinone, 1-methyl-
• Acetylene + 5-Hepten-2-one, 6-methyl-
• Acetylene + 5,9-Undecadien-2-one, 6,10-dimethyl-, (E)-
• Acetylene + 2-Pyrrolidinone, 1-ethenyl-
• 2-Pyrrolidinone + Acetylene

Sources

• KDB Pure (Korean Thermophysical Properties Databank)
• KDB Vapor Pressure Data
• Crippen Method
• Solubility of Acetylene in Alcohols and Ketones
• Joback Method
• KDB
• Aqueous Solubility Prediction Method
• Estimated Solubility Method
• McGowan Method
• NIST Webbook
• The Yaws Handbook of Vapor Pressure

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