The molecular weight of Potassium chloride (KCl) is 74.551.

Potassium chloride (KCl) is an inorganic compound of two elements: Potassium and Chlorine. The molecular weight of Potassium chloride (KCl) is 74.5483 which can be calculated by adding up the atomic weight of Potassium and Chlorine.

CALCULATION PROCEDURE: Potassium Chloride (KCl) Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Potassium chloride molecule. 
You will know different atoms and their number in a Potassium chloride molecule from the chemical formula. The chemical formula of Potassium chloride is KCl. From the chemical formula, you can find that one molecule of Potassium chloride has one Potassium (K) atom and one Chlorine (Cl) atom.

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

Atomic weight of Potassium (K): 39.0983 (Ref: Ciaaw-potassium)
Atomic weight of Chlorine (Cl): 35.4527 (Ref: Jlab-ele017)

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

Number of Potassium atoms in Potassium chloride: 1
Atomic weight of Potassium: 39.0983
Total weight of Potassium atoms in Potassium chloride: 39.0983

Number of Chlorine atoms in Potassium chloride: 1
Atomic weight of Chlorine: 35.4527
Total weight of Chlorine atoms in Potassium chloride: 35.4527

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

Molecular weight of Potassium chloride (KCl): 39.0983 (Potassium) + 35.4527 (Chlorine)

So the molecular weight of Potassium chloride is 74.551.

Potassium Chloride (KCl) Molecular Weight Calculation

REFERENCES:

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

See also:

• Hydrogen chloride molecular weight calculation

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