# Arsenic Pentasulfide [As2S5] Molecular Weight Calculation

The molecular weight of Arsenic pentasulfide [As2S5] is 310.17319.

Arsenic pentasulfide [As2S3] is an inorganic compound of two elements: Arsenic (As) and Sulfur (S). The molecular weight of Arsenic pentasulfide is 310.17319 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

# CALCULATION PROCEDURE: Arsenic pentasulfide [As2S5] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Arsenic pentasulfide molecule.
From the chemical formula, you will know different atoms and their number in an Arsenic pentasulfide molecule. The chemical formula of Arsenic pentasulfide is As2S5. From the chemical formula, you can find that one molecule of Arsenic pentasulfide consists of two Arsenic (As) atoms and five Sulfur (S) 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 Sulfur (S): 32.066 (Ref: Jlab-ele016)

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

Number of Arsenic atoms in Arsenic pentasulfide: 2
Atomic weight of Arsenic: 74.921595
Total weight of Arsenic atoms in Arsenic pentasulfide: 74.921595 x 2 = 149.84319

Number of Sulfur (S) atoms in Arsenic pentasulfide: 5
Atomic weight of Sulfur: 32.066
Total weight of Sulfur atoms in Arsenic pentasulfide: 32.066 x 5 = 160.33

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

Molecular weight of Arsenic pentasulfide: 149.84319 (Arsenic) + 160.33 (Sulfur) = 310.17319

So the molecular weight of Arsenic pentasulfide is 310.17319.

Arsenic pentasulfide [As2S5] Molecular Weight Calculation

## REFERENCES:

• Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
• ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
• Jlab-ele016: https://education.jlab.org/itselemental/ele016.html

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