The molecular weight of Aluminium selenide [Al₂Se₃] is 290.8760768.

Aluminium selenide [Al₂Se₃] (CAS Number: 1302-82-5) is an inorganic compound of two elements: Aluminium (Al) and Selenium (Se). The molecular weight of Aluminium selenide is 290.8760768 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Aluminium Selenide [Al₂Se₃] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Aluminium selenide molecule.
From the chemical formula, you will know different atoms and their number in an Aluminium selenide molecule. The chemical formula of Aluminium selenide is Al₂Se₃. From the chemical formula, you can find that one molecule of Aluminium selenide has two Aluminium (Al) atoms and three Selenium (Se) atoms.

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

Atomic weight of Aluminium (Al): 53.9630768 (Ref: ciaaw-aluminium)
Atomic weight of Selenium (Se): 78.971 (Ref: Jlab-ele034, ciaaw-selenium, Nist-34)

Step 3: Calculate the total weight of each atom in an Aluminium selenide molecule by multiplying its atomic weight by its number.

Number of Aluminium atoms in Aluminium selenide: 2
Atomic weight of Aluminium: 26.9815384
Total weight of Aluminium atoms in Aluminium selenide: 26.9815384 x 2 = 53.9630768

Number of Selenium atoms in Aluminium selenide: 3
Atomic weight of Selenium: 78.971
Total weight of Selenium atoms in Aluminium selenide: 78.971 x 3 = 236.913

Step 4: Calculate the molecular weight of Aluminium selenide by adding up the total weight of all atoms.

Molecular weight of Aluminium selenide: 53.9630768 (Aluminium) + 236.913 (Selenium) = 290.8760768

So the molecular weight of Aluminium selenide is 290.8760768.

Aluminium Selenide [Al₂Se₃] Molecular Weight Calculation

REFERENCES:

• Ciaaw-aluminium: https://www.ciaaw.org/aluminium.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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FURTHER READING

• Aluminium selenide from Wikipedia
• Aluminium selenide from PubChem
• Aluminium selenide from Materion

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