Here’s the explanation without using equations:
To convert atoms to moles, you use the fact that one mole of any substance always contains the same number of particles, called Avogadro’s number. This number is about six hundred and two sextillion particles, which is written as 6.022 × 10²³.
So, if you are given a certain number of atoms, you find out how many moles they represent by comparing them to this fixed number. In simple terms, you check how many times Avogadro’s number fits into the total number of atoms you have. The result tells you how many moles that quantity of atoms is equal to.