What is the average atomic mass of chlorine if it has isotopes of masses 36.96590 and 34.96885, which are 24.47% and 75.53% abundant, respectively?
The average atomic mass of the given sample of chlorine is
Change the percentages to their decimal forms:
Multiply the mass of each isotope by its percent abundance and add. The symbol
The average mass is summation of the percentages of each mass multiplied by that mass.