Isotope abundance problems are usually written in the two ways shown in the following problems.

· The abundance of bromine-79 (78.9183 amu) is equal to 50.69% and the abundance of bromine 81 (80.9163 amu) is equal to 49.31%. What is the average atomic mass of bromine? J

· The average mass of chlorine is 35.4527 amu. One isotope of chlorine has a mass of 34.96885 amu and the other isotope has a mass of 36.9658 amu. What is the isotope abundance of each of these isotopes? J

Return to the problem tutorial. J