Potassium nitrate [KNO3] Molecular Weight Calculation

The molecular weight of Potassium nitrate (KNO3) is 101.10324.

Potassium nitrate (KNO3) Molecular Weight CalculationPotassium nitrate (KNO3) is an inorganic compound of three elements: Potassium, Nitrogen, and Oxygen. The molecular weight of Potassium nitrate is 101.10324 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Potassium, Nitrogen and Oxygen.

To calculate molecular weight of any compound, the first step is to know the constituent elements (atoms) and their number in that particular compound. Then calculate the total atomic weight of each element by multiplying its atomic weight by its number. The sum of total atomic weight of all constituent elements will be the molecular weight of the compound. Note that the value of atomic weight may differ from different sources.

CALCULATION PROCEDURE: Potassium nitrate [KNO3] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Potassium nitrate molecule.
From the chemical formula, you will know different atoms and their number in a Potassium nitrate molecule. Chemical formula of Potassium nitrate is KNO3. From the chemical formula of Potassium nitrate, you can find that one molecule of Potassium nitrate has one Potassium (K) atom, one Nitrogen (N) atom and three Oxygen (O) atoms.

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

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)

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

Number of Potassium atoms in Potassium nitrate: 1
Atomic weight of Potassium: 39.0983
Total weight of Potassium atoms in Potassium nitrate: 39.0983 x 1 = 39.0983

Number of Nitrogen (N) atoms in Potassium nitrate: 1
Atomic weight of Nitrogen: 14.00674
Total weight of Manganese atoms in Potassium nitrate: 14.00674 x 1 = 14.00674

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

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

Molecular weight of Potassium nitrate : 39.0983 (Potassium) + 14.00674 (Nitrogen) + 47.9982 (Oxygen) 

So the molecular weight of Potassium nitrate is 101.10324.

Potassium nitrate [KNO3] Molecular Weight Calculation

Molecular weight of Potassium nitrate (KNO3)
Constituent atomsNumber of each atom
Atomic weight
Total weight
Potassium (K)139.098339.0983
Nitrogen (N)1
14.0067414.00674
Oxygen (O)3
15.999447.9982
Molecular weight of Potassium nitrate (K2CO3):
101.10324

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