# Actinium(III) Bromide [AcBr3] Molecular Weight Calculation

The molecular weight of Actinium(III) bromide [AcBr3] is 466.712.

Actinium(III) bromide [AcBr3] is an inorganic compound of two elements: Actinium (Ac) and Bromine (Br). The molecular weight of Actinium(III) bromide is 466.712 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Actinium and Bromine.

# CALCULATION PROCEDURE: Actinium(III) bromide [AcBr3] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Actinium(III) bromide molecule.
You will know different atoms and their number in an Actinium(III) bromide molecule from the chemical formula. The chemical formula of Actinium(III) bromide is [AcBr3]. From the chemical formula, you can find that one molecule of Actinium(III) bromide has one Actinium (Ac) atom and three Bromine (Br) atoms.

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

Atomic weight of Actinium (Ac): 121.76 (Ref: Jlab-ele089, Lanl-89)
Atomic weight of Bromine (Br): 79.904 (Ref: Jlab-ele035)

Step 3: Calculate the total weight of each atom in an Actinium(III) bromide molecule by multiplying its atomic weight by its number.

Number of Actinium (Ac) atoms in Actinium(III) bromide: 1
Atomic weight of Actinium (Ac): 227
Total weight of Actinium(III) atoms in Actinium(III) bromide: 227 x 1 = 227

Number of Bromine atoms in Actinium(III) bromide: 3
Atomic weight of Bromine (Br): 79.904
Total weight of Bromine atoms in Actinium(III) bromide: 79.904 x 3 = 239.712

Step 4: Calculate the molecular weight of Actinium(III) bromide by adding up the total weight of all atoms.

Molecular weight of Actinium(III) bromide: 227 (Actinium) + 239.712 (Bromine) = 466.712

So the molecular weight of Actinium(III) bromide is 466.712.

Actinium(III) bromide [AcBr3] Molecular Weight Calculation

## REFERENCES:

• Jlab-ele089: https://education.jlab.org/itselemental/ele089.html
• Lanl-89: https://periodic.lanl.gov/89.shtml
• Jlab-ele035: https://education.jlab.org/itselemental/ele035.html