Question

give the expression of relative atomic mass & relative molecular mass.​

Answer 1

Answer and Explanation:

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.

Answer 2

Explanation:

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.

We can say that the relative atomic mass can only be a whole number and it is defined in atoms only however relative molecular mass is defined for molecules and as the mass of one mole of a substance doesn't necessarily need to be a whole number, the relative molecular mass can be a fraction.

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

O

2

is 15.999.