# To account for atomic mass of nitrogen is as 14.0067 , what should be the ratio of N-15 and N-14 atoms in natural nitrogen (atomic mass of N 14 is 14.00307u and N 15 is 15.001?

##### 1 Answer

Jun 20, 2018

The relative atomic mass is a **weighted average** of the individual atomic masses.

That is, we multiply each isotopic mass by its relative importance (percent or fraction of the mixture).

Let

and