The molecular weight of Hydroxyacetylene (HCCOH) is 42.0368.

To calculate molecular weight of any compound, the first step is to know the constituent atoms and their number in that particular compound. Then calculate the total weight of each atom by multiplying its atomic weight by its number. The sum of total weight of all constituent atoms will be the molecular weight of the compound. Note that the value of atomic weight may differ slightly from different sources.

CALCULATION PROCEDURE: Hydroxyacetylene (HCCOH) Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Hydroxyacetylene molecule.
From the chemical formula, you will know different atoms and their number in a Hydroxyacetylene molecule. Chemical formula of Hydroxyacetylene is C₂H₂O. From the chemical formula of Hydroxyacetylene, you can find that one molecule of Hydroxyacetylene has two Carbon (C) atoms, two Hydrogen (H) atoms and one Oxygen (O) atom.

Step 2: Find out atomic weights of each atom (from periodic table).

Atomic weight of Carbon (C): 12.0107 (Ref: Jlab-ele006)
Atomic weight of Hydrogen (H) : 1.008 (Ref: Lanl-1)
Atomic weight of Oxygen (O) : 15.9994 (Ref: Jlab-ele008)

Step 3: Calculate the total weight of each atom present in a Hydroxyacetylene molecule by multiplying its atomic weight by its number.

Number of Carbon atoms in Hydroxyacetylene: 2
Atomic weight of Carbon: 12.0107
Total weight of Carbon atoms in Hydroxyacetylene: 12.0107 x 2 = 24.0214

Number of Hydrogen atoms in Hydroxyacetylene: 2
Atomic weight of Hydrogen: 1.008
Total weight of Hydrogen atoms in Hydroxyacetylene: 1.008 x 2 = 2.016

Number of Oxygen atoms in Hydroxyacetylene: 1
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Hydroxyacetylene: 15.9994 x 1 = 15.9994

Step 4: Calculate the molecular weight of Hydroxyacetylene by adding up the total weight of all atoms.

Molecular weight of Hydroxyacetylene: 24.0214 (Carbon) + 2.016 (Hydrogen) + 15.9994 (Oxygen) = 42.0368

So the molecular weight of Hydroxyacetylene is 42.0368.

Hydroxyacetylene (HCCOH) Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Pubchem-Hydrogen : https://pubchem.ncbi.nlm.nih.gov/element/Hydrogen 
• Jlab-ele006; https://education.jlab.org/itselemental/ele006.html
• Pubchem-6: https://pubchem.ncbi.nlm.nih.gov/element/6
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Pubchem-8: https://pubchem.ncbi.nlm.nih.gov/element/8

See also:

• Apiose (C5H10O5) Molecular Weight Calculation