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Acetylene – space-fillin model
space-fillin model o solid acetylene
IUPAC name
Seestematic IUPAC name
74-86-2 YesY
ChEBI CHEBI:27518 YesY
ChEMBL ChEMBL116336 YesY
ChemSpider 6086 YesY
Jmol-3D images Image
KEGG C01548 YesY
UN nummer 1001 (dissolved)
3138 (in mixtur wi ethylene an propylene)
Molar mass 26.04 g·mol−1
Density 1.097 g/L = 1.097 kg/m3
Meltin pynt −80.8 °C, 192.4 K, −113.4 °F Triple pynt at 1.27 atm
Boilin pynt −84 °C (−119 °F; 189 K) Sublimation pynt at 1 atm
slightly soluble
Acidity (pKa) 25
Molecular shape Linear
Std enthalpy o
+226.88 kJ/mol
Staundart molar
201 J·mol−1·K−1
NFPA 704
Flammability code 4: Will rapidly or completely vaporize at normal atmospheric pressur an temperatur, or is readily dispersed in air an will burn readily. Flash pynt ablo 23 °C (73 °F). E.g., propane Health code 1: Exposur would cause irritation but anly minor residual injury. E.g., turpentine Reactivity code 3: Capable of detonation or explosive decomposition but requires a strong initiatin soorce, must be heatit unner confinement afore initiation, reacts explosively wi watter, or will detonate if severely shocked. E.g., fluorine Special hazards (white): no codeNFPA 704 four-colored diamond
Except whaur otherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
 YesY verify (whit isYesY/N?)
Infobox references

Acetylene (seestematic name: ethyne) is the chemical compoond wi the formula C2H2. It is a hydrocarbon an the simplest alkyne.[2] This colourless gas is widely uised as a fuel an a chemical biggin block. It is unstable in pure furm an thus is uisually haundled as a solution.[3] Pure acetylene is odorless, but commercial grades uisually hae a marked odor due tae impurities.[4]

As an alkyne, acetylene is unsaturatit acause its twa carbon atoms are bondit thegither in a triple bond. The carbon–carbon triple bond places aw fower atoms in the same straicht line, wi CCH bond angles of 180°. Syne acetylene is a linear symmetrical molecule, it possesses the D∞h pynt group.[5]

References[eedit | eedit soorce]

  1. Acyclic Hydrocarbons. Rule A-3. Unsaturated Compounds and Univalent Radicals, IUPAC Nomenclature of Organic Chemistry
  2. R.H.Petrucci, W.S.Harwood and F.G.Herring "General Chemistry", 8th edn.(Prentice-Hall 2002), p.1072
  3. Peter Pässler, Werner Hefner, Klaus Buckl, Helmut Meinass, Andreas Meiswinkel, Hans-Jürgen Wernicke, Günter Ebersberg, Richard Müller, Jürgen Bässler, Hartmut Behringer, Dieter Mayer "Acetylene" in Ullmann's Encyclopedia of Industrial Chemistry, 2008, Wiley-VCH, Weinheim. doi:10.1002/14356007.a01_097.pub3. Article Online Posting Date: 15 October 2008
  4. Compressed Gas Association (1995) [ Material Safety and Data Sheet – Acetylene].
  5. Template:Housecroft3rd

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