question_answer 26)

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

Answer:

Let the % of isotope  and % of isotope   Average atomic mass of an element (X) = 16.2   Average Atomic mass     or        or              or            or              or                         or              Thus % of Isotope   % of Isotope