Question

The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes and 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 be y%. Thus, the percentage of isotope will be (100 − y) %.

Therefore,

Therefore, the percentage of isotopeis 10%.

And, the percentage of isotopeis (100 − 10) % = 90%.