- 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).
- Tig : Autoignition Temperature (K).
- BasG : Gas basicity (kJ/mol).
- Cp,gas : Ideal gas heat capacity (J/mol×K).
- μ : Dipole Moment (debye).
- LFL : Lower Flammability Limit (% in Air).
- UFL : Upper Flammability Limit (% in Air).
- ΔfG° : Standard Gibbs free energy of formation (kJ/mol).
- Rg : Radius of Gyration.
- ΔfH°gas : Enthalpy of formation at standard conditions (kJ/mol).
- ΔfusH° : Enthalpy of fusion at standard conditions (kJ/mol).
- ΔfusH : Enthalpy of fusion at a given temperature (kJ/mol).
- ΔsubH : Enthalpy of sublimation at a given temperature (kJ/mol).
- ΔvapH° : Enthalpy of vaporization at standard conditions (kJ/mol).
- ΔvapH : Enthalpy of vaporization at a given temperature (kJ/mol).
- IE : Ionization energy (eV).
- log10WS : Log10 of Water solubility in mol/l.
- logPoct/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.
- Pc : Critical Pressure (kPa).
- Ptriple : Triple Point Pressure (kPa).
- Pvap : Vapor pressure (kPa).
- ρc : Critical density (kg/m3).
- ρl : Liquid Density (kg/m3).
- Inp : Non-polar retention indices.
- ΔfusS : Entropy of fusion at a given temperature (J/mol×K).
- γ : Surface Tension (N/m).
- Tboil : Normal Boiling Point Temperature (K).
- Tc : Critical Temperature (K).
- Tfus : Normal melting (fusion) point (K).
- Ttriple : Triple Point Temperature (K).
- Vc : Critical Volume (m3/kmol).
- Zc : Critical Compressibility.
- Zra : Rackett Parameter.
- 1: Molecular weight from the IUPAC atomic weights tables.
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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] |
|
|
T(K) Ideal gas heat capacity (J/mol×K) 38 40 42 44 46 48 50 250 300 350 | ||||
| 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] |
|
|
T(K) Enthalpy of sublimation at a given temperature (kJ/mol) 22 23 24 25 140 160 | ||||
| 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] |
|
|
T(K) Enthalpy of vaporization at a given temperature (kJ/mol) 16.3 16.4 16.5 16.6 16.7 16.8 16.9 17 200 250 | ||||
| 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 | |||
|
T(K) Vapor pressure (kPa) 0 1000 2000 3000 4000 5000 150 200 250 | ||||
| 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 | |||
|
T(K) Vapor pressure (kPa) 0 1000 2000 3000 4000 5000 6000 200 250 300 | ||||
| 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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