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

Acetylene

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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
  • Ethine
  • Ethyne
  • Narcylen
  • UN 1001
  • Vinylene
Sources

Physical Properties

Property Value Unit Source
PAff 641.40 kJ/mol NIST
BasG 616.70 kJ/mol NIST
Δf 209.30 kJ/mol Joback Calculated Property
Δfgas 227.40 ± 0.80 kJ/mol NIST
Δfgas 226.70 ± 0.79 kJ/mol NIST
Δfus 3.76 kJ/mol Joback Calculated Property
Δvap 17.61 kJ/mol Joback Calculated Property
IE [11.20; 11.49] eV Show Hide
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
logPoct/wat 0.25 Crippen Calculated Property
Pc 6138.00 ± 10.00 kPa NIST
Ptriple 128.25 ± 0.39 kPa NIST
Tboil 189.00 K NIST
Tboil 189.60 ± 0.30 K NIST
Tc [308.30; 309.70] K Show Hide
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 ± 0.50 K NIST
Tfus 191.40 ± 1.00 K NIST
Tfus 191.65 ± 0.50 K NIST
Ttriple 192.40 ± 0.50 K NIST
Ttriple 191.35 ± 0.30 K NIST
Vc 0.11 m3/kg-mol NIST
Vc 0.11 m3/kg-mol NIST

Temperature Dependent Properties

Property Value Unit Temperature (K) Source
Cp,gas 37.58 J/mol×K 216.4 Joback Calculated Property
ΔfusH 2.54 kJ/mol 142.7 NIST
ΔfusH 3.76 kJ/mol 192.4 NIST
ΔsubH [21.80; 25.20] kJ/mol [121.50; 172.00] Show Hide
Plot of Enthalpy of sublimation at a given temperature.
ΔsubH 23.50 kJ/mol 121.5 NIST
ΔsubH 22.10 kJ/mol 129.0 NIST
ΔsubH 22.70 kJ/mol 159.5 NIST
ΔsubH 21.80 kJ/mol 162.0 NIST
ΔsubH 25.20 kJ/mol 172.0 NIST
ΔvapH [16.30; 17.00] kJ/mol [200.00; 283.00] Show Hide
Plot of Enthalpy of vaporization at a given temperature.
ΔvapH 16.80 kJ/mol 200.0 NIST
ΔvapH 16.70 kJ/mol 208.5 NIST
ΔvapH 17.00 kJ/mol 214.0 NIST
ΔvapH 16.70 kJ/mol 250.0 NIST
ΔvapH 16.40 kJ/mol 261.5 NIST
ΔvapH 16.30 kJ/mol 283.0 NIST
ΔfusS 17.80 J/mol×K 142.7 NIST
ΔfusS 19.50 J/mol×K 192.4 NIST

Molecular Descriptors

Joback and Reid Groups
#CH 2

Similar Compounds

Dicarbon. Ethynyl radical. Ethynol. Propyne. Propynylidene. Propargyl radical. Ethynyloxy radical. Sulfur monoxide. Ethyne, fluoro-. Ethyne, chloro-. Carbon monophosphide. 2-Propynylidyne. Butadiynyl. 2-Butyne. 1,3-Butadiyne.

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Outlier This icon means that the value is more than 2 standard deviations away from the property mean.