# Ethenone (H2CCO) Molecular Weight Calculation

The molecular weight of Ethenone (H2CCO) 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: Ethenone (H2CCO) Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Ethenone molecule.
From the chemical formula, you will know different atoms and their number in a Ethenone molecule. Chemical formula of Ethenone is C2H2O. From the chemical formula of Ethenone, you can find that one molecule of Ethenone 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 Ethenone molecule by multiplying its atomic weight by its number.

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

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

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

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

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

So the molecular weight of Ethenone is 42.0368.

Ethenone (H2CCO) 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