C2H2
5 compounds have this formula on CompoundList.
- Molar mass
- 26.04g/mol
- Monoisotopic mass
- 28.0282Da
- Atoms
- 4
- Elements
- 2
- Rings plus double bonds
- 2
The formula C2H2 describes a molecule made of 2 carbon atoms and 2 hydrogen atoms. It is written in Hill notation: carbon first, then hydrogen, then the other elements in alphabetical order. The formula tells you which atoms are present, not how they are connected, which is why several different chemicals can share it.
Elemental composition
- C Carbon × 292.26%12.011 × 2 = 24.022 g/mol
- H Hydrogen × 27.74%1.008 × 2 = 2.016 g/mol
Compounds with the formula C2H2
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 5 of 5 compounds
Frequently asked questions
What is the molar mass of C2H2?
The molar mass of C2H2 is 26.04 g/mol, calculated from standard atomic weights for 2 carbon atoms and 2 hydrogen atoms. The monoisotopic mass is 28.0282 Da.
How many compounds have the formula C2H2?
CompoundList lists 5 compounds with the molecular formula C2H2, including Acetylene, Acetylene-d2, Acetylene-13C2. Compounds that share a formula are isomers. They contain the same atoms arranged differently, so their properties, uses and prices can be very different.
What is the degree of unsaturation of C2H2?
C2H2 has a degree of unsaturation of 2. That is the total number of rings and pi bonds (a double bond counts as one, a triple bond as two) in any structure with this formula.