# Arsenic Pentaselenide [As2Se5] Molecular Weight Calculation

The molecular weight of Arsenic pentaselenide [As2Se5] is 544.69819.

Arsenic pentaselenide [As2Se5] is an inorganic compound of two elements: Arsenic (As) and Selenium (Se). The molecular weight of Arsenic pentaselenide is 544.69819 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

# CALCULATION PROCEDURE: Arsenic pentaselenide [As2Se5] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Arsenic pentaselenide molecule.
From the chemical formula, you will know different atoms and their number in an Arsenic pentaselenide molecule. The chemical formula of Arsenic pentaselenide is As2Se5. From the chemical formula, you can find that one molecule of Arsenic pentaselenide consists of two Arsenic (As) atoms and five Selenium (Se) 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 Selenium (Se): 78.971 (Ref: Jlab-ele034, ciaaw-selenium, Nist-34)

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

Number of Arsenic (As) atoms in Arsenic pentaselenide: 2
Atomic weight of Arsenic: 74.921595
Total weight of Arsenic atoms in Arsenic pentaselenide: 74.921595 x 2 = 149.84319

Number of Selenium (Se) atoms in Arsenic pentaselenide: 5
Atomic weight of Selenium: 78.971
Total weight of Selenium atoms in Arsenic pentaselenide: 78.971 x 5 = 394.855

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

Molecular weight of Arsenic pentaselenide: 149.84319 (Arsenic) + 394.855 (Selenium) = 544.69819

So the molecular weight of Arsenic pentaselenide is 544.69819.

Arsenic pentaselenide [As2Se5] Molecular Weight Calculation

## REFERENCES:

• Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
• ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
• Jlab-ele034: https://education.jlab.org/itselemental/ele034.html
• ciaaw-selenium: https://www.ciaaw.org/selenium.htm
• Nist-34: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=34

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