Question

What is the chemical formula of gun powder

Answer 1

Here is your answer.

POTASSIUM NITRATE (KNO3).

HOPE IT HELPS YOU.

Answer 2

There is no chemical formula for gunpowder because it is not a single chemical substance, it's a mixture. 

Traditionally gunpowder is made by mixing  charcoal (carbon), sulphur and potassium nitrate in optimum proportions. It's not clear how gunpowder was discovered, or by whom... but most historians agree that it was probably discovered in China around the 9th century, although the first written recipe for gunpowder doesn't appear until the 11th century Song dynasty.

The early Chinese first used gunpowder in fireworks,  before they realised its military potential and began to use it in battle. However, it wasn't until a couple of hundred years later that gunpowder weapons began to appear in the Middle East, India and finally Europe. The earliest Western records of gunpowder appear in the writings of Roger Bacon in the 13th century.
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