MOLE- It is an amount of a substance in which 6.022X1023 particles are present.
6.022X1023 is known as Avogadro’s number.
example – 1 mole oxygen atoms = gram atomic mass of oxygen =16 g = 6.022X1023 atoms
1 mole molecules = gram molecular mass = 6.022X1023 molecules
Example -1 moleoxygen molecules = gram molecular mass of oxygen =32 g = 6.022X1023 oxygen molecules
1 mole ions = formula unit mass = 6.022X1023 ions
Example – 1 mole( SO4)2- ions = formula unit mass of ( SO4)2-=96g = 6.022X1023 ( SO4)2ions