Answer:
Explanation:
To start with, the mass of a substance is centered on the amount of particles contained in it. 
Mass of a substance measure is the same anywhere it is taken. 
In chemistry, the concept of mole is used to find the exact estimate of  the number of entities in a sample. 
A mole of substance is quantity that is used to express the number of particles contained in it. 
   1 mole of any substance contains the Avogadro's number of particles. 
This amount of particles is given as 6.02 x 10²³; the particles can be protons, neutrons, electrons e.t.c. 
To find the number of moles; 
         Number of moles  = 
        Through this, we clearly ascertain the number of entities in a sample given the mass.