# Aluminium Sulfide [Al2S3] Molecular Weight Calculation

The molecular weight of Aluminium sulfide [Al2S3] is 150.1610768.

Aluminium sulfide [Al2S3] (CAS Number: 1302-81-4) is an inorganic compound of two elements: Aluminium and Sulfur. The molecular weight of Aluminium sulfide is 150.1610768 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

# CALCULATION PROCEDURE: Aluminium Sulfide [Al2S3] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Aluminium sulfide molecule.
From the chemical formula, you will know different atoms and their number in an Aluminium sulfide molecule. The chemical formula of Aluminium sulfide is [Al2S3]. From the chemical formula, you can find that one molecule of Aluminium sulfide has two Aluminium (Al) atoms and three Sulfur (S) atoms.

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

Atomic weight of Aluminium (Al): 53.9630768 (Ref: ciaaw-aluminium)
Atomic weight of Sulfur (S): 32.066 (Ref: Jlab-ele016)

Step 3: Calculate the total weight of each atom in an Aluminium sulfide molecule by multiplying its atomic weight by its number.

Number of Aluminium atoms in Aluminium sulfide: 2
Atomic weight of Aluminium: 26.9815384
Total weight of Aluminium atoms in Aluminium sulfide: 26.9815384 x 2 = 53.9630768

Number of Sulfur atoms in Aluminium sulfide: 3
Atomic weight of Sulfur: 32.066
Total weight of Sulfur atoms in Aluminium sulfide: 32.066 x 3 = 96.198

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

Molecular weight of Aluminium sulfide: 53.9630768 (Aluminium) + 96.198 (Sulfur) = 150.1610768

So the molecular weight of Aluminium sulfide is 150.1610768.

Aluminium Sulfide [Al2S3] Molecular Weight Calculation

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