Question

A new synthetic element has two isotopes. If the first isotope has a mass of 259.98 amu and a percent abundance of 62%, what is the percent abundance of the second isotope?

Answer 1

The sum of the percentage abundance of these two isotopes of the new synthetic element should be equal to 100. If we let x be the percent abundance of the second isotope, we have the equation,
62 + x = 100
The value of x from the equation is 38.