The molecular weight of Aluminium sulfate [Al₂(SO₄)₃] is 342.1538768.

Aluminium sulfate [Al₂(SO₄)₃] (CAS Number: 10043-01-3) is an inorganic compound of three elements: Aluminium, Sulfur, and Oxygen. The molecular weight of Aluminium sulfate [Al₂(SO₄)₃] is 342.1538768 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Aluminium sulfate [Al₂(SO₄)₃] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Aluminium sulfate molecule.
From the chemical formula, you will know different atoms and their number in an Aluminium sulfate molecule. The chemical formula of Aluminium sulfate is [Al₂(SO₄)₃]. From the chemical formula, you can find that one molecule of Aluminium sulfate consists of two Aluminium (Al) atoms, three Sulfur (S) atoms, and twelve Oxygen (O) atoms.

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

Atomic weight of Aluminium (Al): 26.9815384 (Ref: ciaaw-aluminium)
Atomic weight of Sulfur (S): 32.066 (Ref: Jlab-ele016)
Atomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008)

Step 3: Calculate the molecular weight of Aluminium sulfate by adding the total weight of all atoms.

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

Number of Sulfur (S) atoms in Aluminium sulfate: 3
Atomic weight of Sulfur: 32.066
Total weight of Sulfur atoms in Aluminium sulfate: 32.066 x 3 = 96.198

Number of Oxygen (O) atoms in Aluminium sulfate: 12
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Aluminium sulfate: 15.9994 x 12 = 191.9928

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

Molecular weight of Aluminium sulfate: 53.9630768 (Aluminium) + 96.198 (Sulfur) + 191.9928 (Oxygen) = 342.1538768

So the molecular weight of Aluminium sulfate is 342.1538768.

Aluminium sulfate [Al₂(SO₄)₃] Molecular Weight Calculation

REFERENCES:

• Ciaaw-aluminium: https://www.ciaaw.org/aluminium.htm
  
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Jlab-ele016: https://education.jlab.org/itselemental/ele016.html
  

FURTHER READING

• Aluminium Sulfate from Wikipedia
• Aluminum Sulfate from Sigma-Aldrich

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• Aluminium Sulfide [Al₂S₃] Molecular Weight Calculation
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