Question

NEED HELP ASAP

An element has three naturally occurring isotopes. Use the information below to calculate the weighted average atomic mass of the element, showing both the setup and the final answer for the calculation.




Isotope

Atomic Mass

Percent Abundance


I

39.96 u

99.59%


II

37.96 u

0.065%


III

35.97 u

0.336

Answer 1

@ze

Answer 2

to calculate the average atomic mass from the mass of the isotopes you have to sum the mass of each isotope multiplied by the natural abundance.

average atomic mass= (Atomic mass I x Percentage abundance I) + (Atomic mass II x Percentage abundance II) + (Atomic mass III x Percentage abundance III)