The molecular weight of Aluminium hydroxide [Al(OH)₃] is 78.0037384.

Aluminium hydroxide [Al(OH)₃] is an inorganic compound of three elements: Aluminium, Hydrogen, and Oxygen. The molecular weight of Aluminium hydroxide is 78.0037384 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Aluminium Hydroxide [Al(OH)₃] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Aluminium hydroxide molecule.
From the chemical formula, you will know different atoms and their number in an Aluminium hydroxide molecule. The chemical formula of Aluminium hydroxide is [Al(OH)₃]. From the chemical formula, you can find that one molecule of Aluminium hydroxide has one Aluminium (Al) atom, three Hydrogen (H) atoms, and three 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 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 in an Aluminium hydroxide molecule by multiplying its atomic weight by its number.

Number of Aluminium atoms in Aluminium hydroxide: 1
Atomic weight of Aluminium: 26.9815384
Total weight of Aluminium atoms in Aluminium hydroxide: 26.9815384 x 1 = 26.9815384

Number of Hydrogen atoms in Aluminium hydroxide: 3
Atomic weight of Hydrogen: 1.008
Total weight of Hydrogen atoms in Aluminium hydroxide: 1.008 x 3 = 3.024

Number of Oxygen atoms in Aluminium hydroxide: 3
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Aluminium hydroxide: 15.9994 x 3 = 47.9982

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

Molecular weight of Aluminium hydroxide: 26.9815384 (Aluminium) + 3.024 (Hydrogen) + 47.9982 (Oxygen) = 78.0037384

So the molecular weight of Aluminium hydroxide is 78.0037384.

Aluminium hydroxide [Al(OH)₃] Molecular Weight Calculation

REFERENCES:

•  
• Ciaaw-aluminium: https://www.ciaaw.org/aluminium.htm
• 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:

• Apiose (C5H10O5) Molecular Weight Calculation

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