For a new element, 60.78% is an isotope with mass 281.9 amu, 2.32% is an isotope with mass 283.7 amu, and 36.90% is an isotope with mass 284.5 amu. Calculate the average atomic mass of this new element.

Question

Quizplus · Accepted Answer

Calculate the weighted average using the percent abundance and mass of each isotope:

(0.6078 x 281.9 amu) + (0.0232 x 283.7 amu) + (0.3690 x 284.5 amu) = 282.9 amu

Therefore, the average atomic mass of the new element is 282.9 amu.

For a New Element, 60