The molecular weight of Potassium antimonyl tartrate trihydrate (C₈H₄K₂O₁₂Sb₂.3H₂O) is 667.8732.

Potassium antimonyl tartrate (C₈H₄K₂O₁₂Sb₂) is an organic compound of five elements: Carbon, Hydrogen, Potassium, Oxygen, Sulfur, and Antimony. Trihydrate form (C₈H₄K₂O₁₂Sb₂.3H₂O) also contains three molecules of water. The molecular weight of Potassium antimonyl tartrate trihydrate is 667.8732 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Carbon, Hydrogen, Potassium, Oxygen and Sulfur, Antimony and three molecules of water.

CALCULATION PROCEDURE: Potassium antimonyl tartrate trihydrate [C₈H₄K₂O₁₂Sb₂.3H₂O] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Potassium antimonyl tartrate trihydrate molecule.
From the chemical formula, you will know different atoms and their number in a Potassium antimonyl tartrate trihydrate molecule. Chemical formula of Potassium antimonyl tartrate trihydrate is C₈H₄K₂O₁₂Sb₂.3H₂O. From the chemical formula of Potassium antimonyl tartrate trihydrate, you can find that one molecule of Potassium antimonyl tartrate trihydrate has eight Carbon (C) atoms, four Hydrogen (H) atoms, two Potassium (K) atoms, twelve Oxygen (O) atoms, one Antimony (Sb) atom,  and three molecules of water (H₂O).

Step 2: Find out atomic weights of each atom (from 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 Potassium (K): 39.0983 (Ref: Ciaaw-potassium)
Atomic weight of Nitrogen (N): 14.00674 (Ref: Jlab-ele007)
Atomic weight of Oxygen (O) : 15.9994 (Ref: Jlab-ele008)
Atomic weight of Antimony (Sb): 121.76 (Ref: ciaaw-antimony)
Molecular weight of water (H₂O): 18.0154 

Step 3: Calculate the molecular weight of Potassium antimonyl tartrate trihydrate by adding the total weight of all atoms.

Number of Carbon (C) atoms in Potassium antimonyl tartrate trihydrate: 8
Atomic weight of Carbon: 12.0107
Total weight of Carbon atoms in Potassium antimonyl tartrate trihydrate: 12.0107 x 8 = 96.0856

Number of Hydrogen (H) atoms in Potassium antimonyl tartrate trihydrate: 4
Atomic weight of Hydrogen: 1.008
Total weight of Hydrogen atoms in Potassium antimonyl tartrate trihydrate: 1.008 x 4 = 4.032

Number of Potassium (K) atoms in Potassium antimonyl tartrate trihydrate: 2
Atomic weight of Potassium: 39.0983
Total weight of Potassium atoms in Potassium antimonyl tartrate trihydrate: 39.0983 x 2 = 78.1966

Number of Oxygen (O) atoms in Potassium antimonyl tartrate trihydrate: 12
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Potassium antimonyl tartrate trihydrate: 15.9994 x 12 = 191.9928

Number of Antimony (Sb) atoms in Potassium antimonyl tartrate trihydrate: 2
Atomic weight of Antimony: 121.76
Total weight of Oxygen atoms in Potassium antimonyl tartrate trihydrate: 121.76 x 2 = 243.52

Number of water (H₂O) molecules in Potassium antimonyl tartrate trihydrate: 3
Molecular weight of water: 18.0154
Total weight of water in Potassium antimonyl tartrate trihydrate: 18.0154 x 3 = 54.0462

Step 4: Calculate the molecular weight of Potassium antimonyl tartrate trihydrate by adding up the total weight of all atoms and water molecules.

Molecular weight of Potassium antimonyl tartrate trihydrate : 96.0856 (Carbon) + 4.032 (Hydrogen) + 78.1966 (Potassium) + 191.9928 (Oxygen) + 243.52 (Antimony) + 54.0462 (water) = 667.8732

So the molecular weight of Potassium antimonyl tartrate trihydrate is 667.8732.

Potassium antimonyl tartrate trihydrate [C₈H₄K₂O₁₂Sb₂.3H₂O] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Jlab-ele006; https://education.jlab.org/itselemental/ele006.html 
• Ciaaw-potassium: https://www.ciaaw.org/potassium.htm 
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Jlab-ele016: https://education.jlab.org/itselemental/ele016.html
• ciaaw-antimony: https://www.ciaaw.org/antimony.htm
  

See also:

• Hydrogen chloride molecular weight calculation