Question

11. The average atomic mass of a sample of an element X is 16.2 u.
What are the percentages of isotopes 16 X and X in the
sample?​

Answer 1

It is given that the average atomic mass of the sample of element X is 16.2 u. Let the percentage of isotope 8 18 X be y%. Thus, the percentage of isotope 8 16 X will be (100 − y)%. Therefore, the percentage of isotope 8 18 X is 10%