1. Potassium has three stable isotopes, potassium-39, potassium-40 and potassium- 41. Calculate the average atomic mass of the element based on the percent abundance of its isotopes

Question

1.     Potassium has three stable isotopes, potassium-39, potassium-40 and potassium- 41. Calculate the average atomic mass of the element based on the percent abundance of its isotopes

Answer 1

The average atomic mass will be a weighted average of the different isotopes.

You haven't provided the % abundance so we cannot provide a numerical answer, but here is how you do it.

(% K-39 x 39) + (%K-40 x 40) +(%K-41 x 41) = average atomic mass