For a new element, 60.54% is an isotope with mass 282.1 amu, 3.28% is an isotope with mass 283.2 amu, and 36.18% is an isotope with mass 284.6 amu. Calculate the average atomic mass of this new element.

Question

Quizplus · Accepted Answer

To find the average atomic mass, we first multiply the mass of each isotope by its percent abundance (expressed as a decimal), and then add up the products.

((0.6054 x 282.1 amu) + (0.0328 x 283.2 amu) + (0.3618 x 284.6 amu)) = 170.70106 amu

Therefore, the average atomic mass of the new element is 170.7 amu, which rounds to 283.0 amu. So, the answer is D.

For a New Element, 60