The molecular weight of Endosulfan (C₉H₆Cl₆O₃S) is 406.9247.

Endosulfan (C₉H₆Cl₆O₃S) is an organic compound of five elements: Carbon, Hydrogen, Chlorine, Oxygen, and Sulfur. The molecular weight of Endosulfan is 406.9247 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Endosulfan  [C₉H₆Cl₆O₃S] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Endosulfan molecule.
You will know different atoms and their number in an Endosulfan molecule from the chemical formula. The chemical formula of Endosulfan is C₉H₆Cl₆O₃S. From the chemical formula, you can find that one molecule of Endosulfan consists of nine Carbon (C) atoms, six Hydrogen (H) atoms, six Chlorine atoms, three Oxygen (O) atoms, and one Sulfur atom.

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

Atomic weight of Carbon (C): 12.0107 (Ref: Jlab-ele006)
Atomic weight of Hydrogen (H): 1.008 (Ref: Lanl-1)
Atomic weight of Chlorine (Cl): 35.4527 (Ref: jlab-ele017)
Atomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008)
Atomic weight of Sulfur (S): 32.066 (Ref: Jlab-ele016)

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

Number of Carbon atoms in Endosulfan: 9
Atomic weight of Carbon (C): 12.0107
Total weight of Carbon atoms in Endosulfan: 12.0107 x 9 = 108.0963

Number of Hydrogen atoms in Endosulfan: 6
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Endosulfan: 1.008 x 6 = 6.048

Number of Chlorine atoms in Endosulfan: 6
Atomic weight of Chlorine (Cl): 35.4527
Total weight of Chlorine atoms in Endosulfan: 35.4527 x 6 = 212.7162

Number of Oxygen atoms in Endosulfan: 3
Atomic weight of Oxygen (O): 15.9994
Total weight of Oxygen atoms in Endosulfan: 15.9994 x 3 = 47.9982

Number of Sulfur atoms in Endosulfan: 1
Atomic weight of Sulfur (S): 32.066
Total weight of Sulfur atoms in Endosulfan: 32.066 x 1 = 32.066

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

Molecular weight of Endosulfan: 108.0963 (Carbon) + 6.048 (Hydrogen) + 212.7162 (Chlorine) + 47.9982 (Oxygen) + 32.066 (Sulfur) = 406.9247

So the molecular weight of Endosulfan is 406.9247.

Endosulfan [C₉H₆Cl₆O₃S] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Jlab-ele006: https://education.jlab.org/itselemental/ele006.html 
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
  
• Jlab-ele016: https://education.jlab.org/itselemental/ele016.html
• Pubchem-Chlorine: https://pubchem.ncbi.nlm.nih.gov/element/Chlorine

See also:

• Hydrogen chloride molecular weight calculation