# Magnesium Chloride Hexahydrate (MgCl2.6H2O) Molecular Weight Calculation

The molecular weight of Magnesium Chloride Hexahydrate (MgCl2.6H2O) is 203.3028.

Magnesium Chloride (MgCl2) is an inorganic compound of two elements: Magnesium and Chlorine. The Hexahydrate form of Magnesium Chloride (MgCl2.6H2O) also contains 6 water molecules. The molecular weight of Magnesium Chloride Hexahydrate is 203.3028 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements and water molecules.

# CALCULATION PROCEDURE: Magnesium Chloride Hexahydrate (MgCl2.6H2O) Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Magnesium Chloride Hexahydrate molecule.
You will know different atoms and their number in a Magnesium Chloride Hexahydrate molecule from the chemical formula. The chemical formula of Magnesium Chloride Hexahydrate is MgCl2.6H2O. The chemical formula shows that one molecule of Magnesium Chloride Hexahydrate consists of one Magnesium (Mg) atom,  two Chlorine (Cl) atoms, and six molecules of water.

Step 2: Find out the atomic weights of each atom.

Atomic weight of magnesium (Mg): 24.305 (Ref: Pubchem-12, Jlab-ele012)
Atomic weight of chlorine (Cl): 35.4527 (Ref: Pubchem-Chlorine, jlab-ele017)

Step 3: Calculate the molecular weight of Magnesium Chloride Hexahydrate by adding the total weight of all atoms.

Number of magnesium atoms in Magnesium Chloride Hexahydrate: 1
Atomic weight of magnesium: 24.305
Total weight of magnesium atoms in Magnesium Chloride Hexahydrate: 24.305 x 1 = 24.305

Number of chlorine atoms in Magnesium Chloride Hexahydrate: 2
Atomic weight of chlorine: 35.4527
Total weight of chlorine atoms in Magnesium Chloride Hexahydrate: 35.4527 x 2 = 70.9052

Number of water (H2O) molecules in Potassium antimonyl tartrate trihydrate: 6
Molecular weight of water: 18.0154
Total weight of water in Potassium antimonyl tartrate trihydrate: 18.0154 x 6 = 108.0924

Step 4: Calculate the molecular weight of Magnesium Chloride Hexahydrate by adding up the total weight of all atoms.

Molecular weight of Magnesium Chloride Hexahydrate (MgCl2.6H20): 24.305 (Magnesium) + 70.90 (Chlorine) + 108.0924 (water) = 203.3028

So the molecular weight of Magnesium Chloride Hexahydrate is 203.3028.

## REFERENCES:

• Pubchem-12: https://pubchem.ncbi.nlm.nih.gov/element/12
• Jlab-ele012: https://education.jlab.org/itselemental/ele012.html
• Pubchem-Chlorine: https://pubchem.ncbi.nlm.nih.gov/element/Chlorine
• jlab-ele017: https://education.jlab.org/itselemental/ele017.html