# Actinium(III) Sulfide [Ac2S3] Molecular Weight Calculation

The molecular weight of Actinium(III) sulfide [Ac2S3] is 550.198.

Actinium(III) sulfide [Ac2S3] is an inorganic compound of two elements: Actinium (Ac) and Sulfur (S). The molecular weight of Actinium(III) sulfide is 550.198 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Actinium and Sulfur.

# CALCULATION PROCEDURE: Actinium(III) Sulfide [Ac2S3] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Actinium(III) sulfide molecule.
You will know different atoms and their number in an Actinium(III) sulfide molecule from the chemical formula. The chemical formula of Actinium(III) sulfide is [Ac2S3]. From the chemical formula, you can find that one molecule of Actinium(III) sulfide has two Actinium (Ac) atoms and three Sulfur (S) atoms.

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

Atomic weight of Actinium (Ac): 227 (Ref: Jlab-ele089, Lanl-89, Nist-89)
Atomic weight of Sulfur (S): 32.066 (Ref: Jlab-ele016)

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

Number of Actinium (Ac) atoms in Actinium(III) sulfide: 2
Atomic weight of Actinium (Ac): 227
Total weight of Actinium(III) atoms in Actinium(III) sulfide: 227 x 2 = 454

Number of Sulfur (S) atoms in Actinium(III) sulfide: 3
Atomic weight of Sulfur: 32.066
Total weight of Sulfur atoms in Actinium(III) sulfide: 32.066 x 3 = 96.198

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

Molecular weight of Actinium(III) sulfide: 454 (Actinium) + 96.198 (Sulfur) = 550.198

So the molecular weight of Actinium(III) sulfide is 550.198.

Actinium(III) Sulfide [Ac2S3] Molecular Weight Calculation

## REFERENCES:

• Jlab-ele016: https://education.jlab.org/itselemental/ele016.html
• Jlab-ele089: https://education.jlab.org/itselemental/ele089.html
• Lanl-89: https://periodic.lanl.gov/89.shtml
• Nist-89: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=89

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