The molecular weight of Ethylene (C₂H₄) is 28.0534.

Ethylene (C₂H₄) is an organic compound of two elements: Carbon, and Hydrogen. The molecular weight of Ethylene is 28.0534 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Ethylene  [C₂H₄] Molecular Weight Calculation

Step 1: Find the chemical formula and determine constituent atoms and their number in an Ethylene molecule.
You will know different atoms and their number in an Ethylene molecule from the chemical formula. The chemical formula of Ethylene is C₂H₄. The chemical formula shows that one Ethylene molecule consists of two Carbon (C) atoms and four 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 Ethylene molecule by multiplying its atomic weight by its number.

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

Number of Hydrogen atoms in Ethylene: 4
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Ethylene: 1.008 x 4 = 4.032

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

Molecular weight of Ethylene: 24.0214 (Carbon) + 4.032 (Hydrogen) = 28.0534

So the molecular weight of Ethylene is 28.0534.

Ethylene [C₂H₄] 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