The molecular weight of Actinium(III) chloride [AcCl_{3}] is 333.3581.

Actinium(III) chloride [AcCl_{3}] is an inorganic compound of two elements: Actinium (Ac) and Chlorine (Cl). The molecular weight of Actinium(III) chloride is 333.3581 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Actinium and Chlorine.

**CALCULATION PROCEDURE: Actinium(III) Chloride [AcCl**_{3}] Molecular Weight Calculation

_{3}] Molecular Weight Calculation

**Step 1: Find out the chemical formula and determine constituent atoms and their number in an Actinium(III) chloride molecule.**You will know different atoms and their number in an Actinium(III) chloride molecule from the chemical formula. The chemical formula of Actinium(III) chloride is [AcCl

_{3}]. From the chemical formula, you can find that one molecule of Actinium(III) chloride has one Actinium (Ac) atom and three Chlorine (Cl) 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 Chlorine (Cl): 35.4527 (Ref: Jlab-ele017)

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

Number of Actinium (Ac) atoms in Actinium(III) chloride: 1

Atomic weight of Actinium (Ac): 227

Total weight of Actinium(III) atoms in Actinium(III) chloride: 227 x 1 = 227

Number of Chlorine atoms in Actinium(III) chloride: 3

Atomic weight of Chlorine (Cl): 35.4527

Total weight of Chlorine atoms in Actinium(III) chloride: 35.4527 x 3 = 106.3581

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

Molecular weight of Actinium(III) chloride: 227 (Actinium) + 106.3581 (Chlorine) = 333.3581

So the molecular weight of Actinium(III) chloride is 333.3581.

Actinium(III) chloride [AcCl_{3}] Molecular Weight Calculation

Molecular weight of Actinium(III) chloride [AcCl_{3}] | |||

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

Actinium (Ac) | 1 | 227 | 227 |

Chlorine (Cl) | 3 | 35.4527 | 106.3581 |

Molecular weight of Actinium(III) chloride [AcCl_{3}]: | 333.3581 |

## REFERENCES:

- 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
- Jlab-ele017: https://education.jlab.org/itselemental/ele017.html

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_{3}] Molecular Weight Calculation”