Nitrogen occurs in nature in the form of two isotopes with atomic mass 14 and 15 respectively. If average atomic mass of nitrogen is 14.0067, what is the % abundabce of the two isotopes ?

Explanation

Let % abundance of N-14 isotope = x
Then % abundance of N-15 isotope = (100 - x)
`"The average atomic mass" = ( (14x+ (100-x)15)/(100))= 14.0067` or x = 1400.67 – 1500 = -99.33 or x = 99.33
Thus, % abundance of N-14 isotope = 99.33% % abundance of N-15 isotope = 0.67%