The molecular weight of Aluminium bromide hexahydrate [AlBr_{3}.6H_{2}O] is 374.7859384.

Aluminium bromide [AlBr_{3}] is an inorganic compound of two elements: Aluminium and Bromine. The hexahydrate form of Aluminium bromide [AlBr_{3}.6H_{2}O] also contains 6 water molecules. The molecular weight of Aluminium bromide hexahydrate is 374.7859384 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements and water molecules.

**CALCULATION PROCEDURE: Aluminium bromide hexahydrate [AlBr**_{3}.6H_{2}O] Molecular Weight Calculation

_{3}.6H

_{2}O] Molecular Weight Calculation

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

_{3}.6H

_{2}O. From the chemical formula, you can find that one molecule of Aluminium bromide hexahydrate consists of one Aluminium (Al) atom, three Bromine (Br) atoms, and six water molecules.

**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 Bromine (Br): 79.904 (Ref: Jlab-ele035)

Molecular weight of Water [H2O]: 18.0154

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

Number of Aluminium atoms in Aluminium bromide hexahydrate: 1

Atomic weight of Aluminium: 26.9815384

Total weight of Aluminium atoms in Aluminium bromide hexahydrate: 26.9815384 x 1 = 26.9815384

Number of Bromine (Br) atoms in Aluminium bromide hexahydrate: 3

Atomic weight of Bromine: 79.904

Total weight of Bromine atoms in Aluminium bromide hexahydrate: 79.904 x 3 = 239.712

Number of water (H_{2}O) molecules in Aluminium bromide hexahydrate: 6

Molecular weight of water: 18.0154

Total weight of water in Aluminium bromide hexahydrate: 18.0154 x 6 = 108.0924

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

Molecular weight of Aluminium bromide hexahydrate: 26.9815384 (Aluminium) + 239.712 (Bromine) + 108.0924 (Water) = 374.7859384

So the molecular weight of Aluminium bromide hexahydrate is 374.7859384.

**Aluminium bromide hexahydrate [AlBr _{3}.6H_{2}O] Molecular Weight Calculation**

Molecular weight of Aluminium bromide hexahydrate [AlBr_{3}.6H_{2}O] | |||

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

Aluminium (Al) | 1 | 26.9815384 | 26.9815384 |

Bromine (Br) | 3 | 79.904 | 239.712 |

Water (H2O) | 6 | 18.0154 | 108.0924 |

Molecular weight of Aluminium bromide hexahydrate [AlBr_{3}.6H_{2}O]: | 374.7859384 |

## REFERENCES:

- Ciaaw-aluminium: https://www.ciaaw.org/aluminium.htm
- Jlab-ele035: https://education.jlab.org/itselemental/ele035.htm

# See also:

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