Question

The average atomic mass of a sample of an element y is 35.5 u. What are the percentages of isotopes17Y37 and 17Y35 in the sample?​

Answer 1

Answer:

Use the atomic masses of each of the isotopes along with their percent abundances to calculate the average atomic mass. Change each percent abundance into decimal form by dividing by 100. Multiply this value by the atomic mass of that isotope. Add together for each isotope to get the average atomic mass