Question

Give the expression of relative atomic mass and relative molecular mass

Answer 1

The sum of number of protons and neutrons of an atom is known as Relative Atomic Mass. Relative Molecular mass is defined as the ratio of the mass of 1 mole of that substance to one-twelfth the mass of one mole of C-12.

For example :

The relative atomic mass of an Oxygen atom = 8 (number of protons ) + 8 (number of neutrons) = 16

and,

The relative molecular mass of Oxygen molecule O2O2 is 15.999.