The molecular weight of Potassium azide [KN_{3}] is 81.11852.

Potassium azide (KN_{3}) is an inorganic compound of two elements: Potassium and Nitrogen. The molecular weight of Potassium azide is 81.11852 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Potassium and Nitrogen.

**CALCULATION PROCEDURE: Potassium azide [KN _{3}] Molecular Weight Calculation**

**Step 1: Find out the chemical formula and determine constituent atoms and their number in a Potassium azide molecule.**From the chemical formula, you will know different atoms and their number in a Potassium azide molecule. Chemical formula of Potassium azide is KN

_{3}. From the chemical formula of Potassium azide, you can find that one molecule of Potassium azide has one Potassium (K) atom, and three Nitrogen (N) 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)

**Step 3: Calculate the total weight of each atom present in a Potassium azide molecule by multiplying its atomic weight by its number.**

Number of Potassium atoms in Potassium azide: 1

Atomic weight of Potassium (K): 39.0983

Total weight of Potassium atoms in Potassium azide: 39.0983 x 1 = 39.0983

Number of Nitrogen atoms in Potassium azide: 1

Atomic weight of Nitrogen (N): 14.00674

Total weight of Nitrogen atoms in Potassium azide: 14.00674 x 3 = 42.02022

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

Molecular weight of Potassium azide: 39.0983 (Potassium) + 42.02022 (Nitrogen) = 81.11852

So the molecular weight of Potassium azide is 81.11852.

Potassium azide [KN_{3}] Molecular Weight Calculation

Molecular weight of Potassium azide (KN_{3}) | |||

Constituent atoms | Number of each atom | Atomic weight | Total weight |

Potassium (K) | 1 | 39.0983 | 39.0983 |

Nitrogen (N) | 3 | 14.00674 | 42.02022 |

Molecular weight of Potassium azide: | 81.11852 |

## REFERENCES:

- Ciaaw-potassium : https://www.ciaaw.org/potassium.htm
- Jlab-ele007: https://education.jlab.org/itselemental/ele007.html