The mole is a unit of measurement used to describe the amount of a chemical species.One mole contains 6.022x1023 particles (atoms, molecules, ions, electrons).n =
mass of substance(g)
molecular mass
=
m
MW
Molarity: In chemistry, molarity is the most frequently used method of expressing concentration of a
solution.It can be used to
describe the number of atoms, molecules, ions, electrons, etc.To determine the number of moles, n, in a given quantity of a substance, you divide the given
quantity of the substance by the molecular weight.