The molecular weight of Arsenic triiodide [AsI₃] is 455.635005.

Arsenic triiodide [AsI₃] is an inorganic compound of two elements: Arsenic (As)  and Iodine (I). The molecular weight of Arsenic triiodide is 455.635005 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Arsenic triiodide [AsI₃] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Arsenic triiodide molecule.
From the chemical formula, you will know different atoms and their number in an Arsenic triiodide molecule. The chemical formula of Arsenic triiodide is AsI₃. From the chemical formula, you can find that one molecule of Arsenic triiodide consists of one Arsenic (As) atom and three Iodine (I) atoms.

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

Atomic weight of Arsenic (As): 74.921595 (Ref: Jlab-ele033, ciaaw-arsenic)
Atomic weight of Iodine (I): 126.90447 (Ref: Jlab-ele053, Ciaaw-iodine, Nist-53)

Step 3: Calculate the molecular weight of Arsenic triiodide by adding the total weight of all atoms.

Number of Arsenic atoms in Arsenic triiodide: 1
Atomic weight of Arsenic: 74.921595
Total weight of Arsenic atoms in Arsenic triiodide: 74.921595 x 1 = 74.921595

Number of Iodine (I) atoms in Arsenic triiodide: 3
Atomic weight of Iodine: 126.90447
Total weight of Iodine atoms in Arsenic triiodide: 126.90447 x 3 = 380.71341

Step 4: Calculate the molecular weight of Arsenic triiodide by adding up the total weight of all atoms.

Molecular weight of Arsenic triiodide: 74.921595 (Arsenic) + 380.71341 (Iodine) = 455.635005

So the molecular weight of Arsenic triiodide is 455.635005.

Arsenic triiodide [AsI₃] Molecular Weight Calculation

REFERENCES:

• Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
• ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
• Jlab-ele053: https://education.jlab.org/itselemental/ele053.html
• Ciaaw-iodine: https://www.ciaaw.org/iodine.htm
• Nist-53: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=53

RELATED POSTS

• Element: Arsenic (As)
• Arsenic Trifluoride [AsF₃] Molecular Weight Calculation
• Arsenic Pentafluoride [AsF₅] Molecular Weight Calculation
• Arsenic Trichloride [AsCl₃] Molecular Weight Calculation
• Arsenic Pentachloride [AsCl₅] Molecular Weight Calculation
• Arsenic Tribromide [AsBr₃] Molecular Weight Calculation
• Arsine [AsH₃] Molecular Weight Calculation
• Aluminium Arsenide [AlAs] Molecular Weight Calculation

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