# Arsenic Trichloride [AsCl3] Molecular Weight Calculation

The molecular weight of Arsenic trichloride [AsCl3] is 181.279695.

Arsenic trichloride [AsCl3] is an inorganic compound of two elements: Arsenic (As) and Chlorine (Cl). The molecular weight of Arsenic trichloride is 181.279695 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

# CALCULATION PROCEDURE: Arsenic Trichloride [AsCl3] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Arsenic trichloride molecule.
From the chemical formula, you will know different atoms and their number in an Arsenic trichloride molecule. The chemical formula of Arsenic trichloride is AsCl3. From the chemical formula, you can find that one molecule of Arsenic trichloride consists of one Arsenic (As) atom and three Chlorine (Cl) 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 Chlorine (Cl): 35.4527 (Ref: Jlab-ele017)

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

Number of Arsenic (As) atoms in Arsenic trichloride: 1
Atomic weight of Arsenic: 74.921595
Total weight of Arsenic atoms in Arsenic trichloride: 74.921595 x 1 = 74.921595

Number of Chlorine (Cl) atoms in Arsenic trichloride: 3
Atomic weight of Chlorine: 35.4527
Total weight of Chlorine atoms in Arsenic trichloride: 35.4527 x 3 = 106.3581

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

Molecular weight of Arsenic trichloride: 74.921595 (Arsenic) + 106.3581 (Chlorine) = 181.279695

So the molecular weight of Arsenic trichloride is 181.279695.

Arsenic trichloride [AsCl3] Molecular Weight Calculation

## REFERENCES:

• Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
• ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
• Jlab-ele017: https://education.jlab.org/itselemental/ele017.html

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