# Calcium Chloride Hexahydrate (CaCl2.6H2O) Molecular Weight Calculation

The molecular weight of Calcium chloride hexahydrate [CaCl2.6H2O] (CAS Registry Number: 7774-34-7) is 219.0758.

Calcium Chloride (CaCl2) is an inorganic compound of two elements: Calcium (Ca) and Chlorine (Cl). The hexahydrate form of Calcium Chloride (CaCl2.6H2O) also contains 6 water molecules. The molecular weight of Calcium chloride hexahydrate is 219.0758 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

# CALCULATION PROCEDURE: Calcium chloride hexahydrate (CaCl2.6H2O) Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Calcium chloride hexahydrate molecule.
You will know different atoms and their number in a Calcium chloride hexahydrate molecule from the chemical formula. The chemical formula of Calcium chloride hexahydrate is CaCl2.6H2O. From the chemical formula, you can find that one molecule of Calcium chloride hexahydrate consists of one Calcium (Ca) atom, two Chlorine (Cl) atoms, and six molecules of water.

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

Atomic weight of Calcium (Ca): 40.078 (Ref: Ciaaw-calcium, Jlab-ele020)
Atomic
weight of Chlorine (Cl): 35.4527 (Ref: Jlab-ele017)
Molecular weight of Water [H2O]: 18.0154

Step 3: Calculate the molecular weight of Calcium chloride hexahydrate by adding the total weight of all atoms.

Number of Calcium atoms in Calcium chloride hexahydrate: 1
Atomic weight of Calcium: 40.078
Total weight of Calcium atoms in Calcium chloride hexahydrate: 40.078 x 1 = 40.078

Number of Chlorine atoms in Calcium chloride hexahydrate: 2
Atomic weight of Chlorine: 35.4527
Total weight of Chlorine atoms in Calcium chloride hexahydrate: 35.4527 x 2 = 70.9054

Number of water (H2O) molecules in Calcium chloride hexahydrate: 6
Molecular weight of water: 18.0154
Total weight of water in Calcium chloride hexahydrate: 18.0154 x 6 = 108.0924

Step 4: Calculate the molecular weight of Calcium chloride hexahydrate by adding up the total weight of all atoms.

Molecular weight of Calcium chloride hexahydrate (CaCl2.6H2O): 40.078 (Calcium) + 70.9054 (Chlorine) + 108.0924 (water) = 219.0758

So the molecular weight of Calcium chloride hexahydrate is 219.0758.

## REFERENCES

• Ciaaw-calcium: https://www.ciaaw.org/calcium.htm
• Jlab-ele020: https://education.jlab.org/itselemental/ele020.html
• jlab-ele017: https://education.jlab.org/itselemental/ele017.html

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