The molecular weight of Aluminium chloride [AlCl_{3}] is 133.3396384.

Aluminium chloride [AlCl_{3}] is an inorganic compound of two elements: Aluminium and Chlorine. The molecular weight of Aluminium chloride is 133.3396384 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

**Step 1: Find out the chemical formula and determine constituent atoms and their number in an Aluminium chloride molecule. **From the chemical formula, you will know different atoms and their number in an Aluminium chloride molecule. The chemical formula of Aluminium chloride is AlCl

_{3}. From the chemical formula, you can find that one molecule of Aluminium chloride consists of one Aluminium (Al) atom and three Chlorine (Cl) 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 Chlorine (Cl): 35.4527 (Ref: Jlab-ele017)

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

Number of Aluminium atoms in Aluminium chloride: 1

Atomic weight of Aluminium: 26.9815384

Total weight of Aluminium atoms in Aluminium chloride: 26.9815384 x 1 = 26.9815384

Number of Chlorine (Cl) atoms in Aluminium chloride: 3

Atomic weight of Chlorine: 35.4527

Total weight of Chlorine atoms in Aluminium chloride: 35.4527 x 3 = 106.3581

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

Molecular weight of Aluminium chloride: 26.9815384 (Aluminium) + 106.3581 (Chlorine) = 133.3396384

So the molecular weight of Aluminium chloride is 133.3396384.

Aluminium chloride [AlCl_{3}] Molecular Weight Calculation

Molecular weight of Aluminium chloride [AlCl_{3}] |
|||

Constituent atoms | Number of each atom |
Atomic weight |
Total weight |

Aluminium (Al) |
1 |
26.9815384 | 26.9815384 |

Chlorine (Cl) | 3 |
35.4527 | 106.3581 |

Molecular weight of Aluminium chloride [AlCl_{3}]: |
133.3396384 |

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