Arsenic Trioxide [As2O3] Molecular Weight Calculation

The molecular weight of Arsenic trioxide [As2O3] is 197.84139.

Arsenic trioxide [As2O3] is an inorganic compound of two elements: Arsenic (As) and Oxygen (O). The molecular weight of Arsenic trioxide is 197.84139 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Arsenic trioxide [As2O3] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Arsenic trioxide molecule.
From the chemical formula, you will know different atoms and their number in an Arsenic trioxide molecule. The chemical formula of Arsenic trioxide is As2O3. From the chemical formula, you can find that one molecule of Arsenic trioxide consists of two Arsenic (As) atoms and three Oxygen (O) atoms.

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

Atomic weight of Arsenic (As): 74.921595 (Ref: Jlab-ele033, ciaaw-arsenic)
Atomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008)

Step 3: Calculate the molecular weight of Arsenic trioxide by adding the total weight of all atoms.

Number of Arsenic atoms in Arsenic trioxide: 2
Atomic weight of Arsenic: 74.921595
Total weight of Arsenic atoms in Arsenic trioxide: 74.921595 x 2 = 149.84319

Number of Oxygen (O) atoms in Arsenic trioxide: 3
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Arsenic trioxide: 15.9994 x 3 = 47.9982

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

Molecular weight of Arsenic trioxide: 149.84319 (Arsenic) + 47.9982 (Oxygen) = 197.84139

So the molecular weight of Arsenic trioxide is 197.84139.

Arsenic trioxide [As2O3] Molecular Weight Calculation

REFERENCES:

• Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
• ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html

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