What is the average atomic mass of silicon? Given the following data, calculate the average atomic mass of silicon.
isotope = Si-28
isotope = Si-29
We’re being asked to calculate the average atomic mass of Silicon (Si). We can use the following equation:
where atomic mass = average atomic mass of the element and f.a. = fractional abundance of the isotope. To get f.a., we simply need to divide the given percent abundance by 100.