The molecular weight of Acetylene (C₂H₂) is 26.0374.

Acetylene (C₂H₂) is an organic compound of two elements: Carbon, and Hydrogen. The molecular weight of Acetylene is 26.0374 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Acetylene  [C₂H₂] Molecular Weight Calculation

Step 1: Find the chemical formula and determine constituent atoms and their number in an Acetylene molecule.
You will know different atoms and their number in an Acetylene molecule from the chemical formula. The chemical formula of Acetylene is C₂H₂. The chemical formula shows that one Acetylene molecule consists of two Carbon (C) atoms and two Hydrogen (H) atoms.

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

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

Step 3: Calculate the total weight of each atom in an Acetylene molecule by multiplying its atomic weight by its number.

Number of Carbon atoms in Acetylene: 2
Atomic weight of Carbon (C): 12.0107
Total weight of Carbon atoms in Acetylene: 12.0107 x 2 = 24.0214

Number of Hydrogen atoms in Acetylene: 2
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Acetylene: 1.008 x 2 = 2.016

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

Molecular weight of Acetylene: 24.0214 (Carbon) + 2.016 (Hydrogen) = 26.0374

So the molecular weight of Acetylene is 26.0374.

Acetylene [C₂H₂] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Jlab-ele006: https://education.jlab.org/itselemental/ele006.html 

See also:

• Hydrogen chloride molecular weight calculation