How many particles are in a mole?
In science, we have a name for this, called Avogadro's number, and it describes the number of representative particles in one mole of a substance.
Avogadro's number is
The inverse mole unit tells us there are
The official definition of the mole is the quantity that describes the number of elementary entities as there are atoms in
From this definition, we see that
To find the number of moles of a substance present, we divide the mass of the substance by its molar mass, which we see from the definition of molar mass:
#"molar mass" = "mass"/"mol"#
#"mol" = "mass"/"molar mass"#