Hydrogen Peroxide [H2O2] Molecular Weight Calculation

The molecular weight of Hydrogen peroxide [H2O2] is 34.0148.

Hydrogen peroxide [H2O2] Molecular Weight CalculationHydrogen peroxide [H2O2] is an inorganic compound of two elements: Hydrogen, and Oxygen. The molecular weight of Hydrogen peroxide is 34.0148 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Hydrogen, and Oxygen.

CALCULATION PROCEDURE: Hydrogen peroxide [H2O2] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Hydrogen peroxide molecule.
You will know different atoms and their number in a Hydrogen peroxide molecule from the chemical formula. The chemical formula of Hydrogen peroxide is H2O2. From the chemical formula, you can find that one molecule of Hydrogen peroxide has two Hydrogen (H) atoms and two Oxygen (O) atoms.

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

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 Hydrogen peroxide molecule by multiplying its atomic weight by its number.

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

Number of Oxygen atoms in Hydrogen peroxide: 2
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Hydrogen peroxide: 15.9994 x 2 = 31.9988

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

Molecular weight of Hydrogen peroxide: 2.016 (Hydrogen) + 31.9988 (Oxygen) = 34.0148

So the molecular weight of Hydrogen peroxide is 34.0148.

Hydrogen peroxide [H2O2] Molecular Weight Calculation

Molecular weight of Hydrogen peroxide
Constituent atoms
Number of each atom
Atomic weightTotal weight
Hydrogen (H)
2
1.0082.016
Oxygen (O)
2
15.999431.9988
Molecular weight of Hydrogen peroxide:
34.0148

REFERENCES:

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

See also:

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