- 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
- UN 1001
- ethine
- ethyne
- narcylen
- 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 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 |
| 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. Solubility Prediction | |
| log10WS | 0.29 | Estimated Solubility | |
| 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. Solubility Prediction |
| 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 |
Cheméo can also estimate Enthalpy of vaporization at standard conditions for this compound, but it falls outside the models' validated range, so it is not shown here. Open the prediction tool to compute it on demand.
Temperature Dependent Properties
| Property | Value | Unit | Temperature (K) | Source |
|---|---|---|---|---|
| Cp,gas | [37.60; 49.00] | J/mol×K | [216.60; 367.63] |
|
| Cp,gas | 37.60 | J/mol×K | 216.60 | Joback Calculated Property |
| Cp,gas | 39.85 | J/mol×K | 241.77 | Joback Calculated Property |
| Cp,gas | 41.96 | J/mol×K | 266.94 | Joback Calculated Property |
| Cp,gas | 43.92 | J/mol×K | 292.11 | Joback Calculated Property |
| Cp,gas | 45.74 | J/mol×K | 317.29 | Joback Calculated Property |
| Cp,gas | 47.43 | J/mol×K | 342.46 | Joback Calculated Property |
| Cp,gas | 49.00 | J/mol×K | 367.63 | 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 Yaws Handbook of Vapor Pressure
|
| 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 Vapor Pressure Data
|
| 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 + 2-Propanol
- 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 + 1-vinyl-2-pyrrolidinone
- 2-Pyrrolidinone + Acetylene
Sources
- 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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