✅ Atomic and Molecular Masses
Mass of an atom.
Reported in atomic mass unit “amu” or unified mass “u”
One atomic mass unit i.e. amu, is the mass exactly equal to one-twelfth the mass of one carbon-12 atom.
Mass of a molecule of covalent compound.
It is equal to the sum of atomic masses of all the elements present in the molecule.
Formula Unit Mass
Mass of a molecule of an ionic compound
It is also equal to the sum of atomic masses of all the elements present in the molecule
✅ Mole Concept:
Unit of amount of substance.
One mole amount of substance that contains as many particles or entities as there are atoms in exactly 12 g of the 12C isotope.
Mass of one mole of a substance in gram
Molar mass in gram in numerically equal to atomic/molecular/formula mass in amu or u.