Answer:
The average atomic mass is 86.565
Explanation:
An element's average atomic mass is the sum of the products of the masses of the isotopes of the element and their percentage abundance divided by 100
The average atomic mass of the Element X is given as follows;
Isotope type 1 (85.91) ×
Isotope [tex]{}[/tex] Abundance (%) Mass /100 Portion of average mass
Type 1 [tex]{}[/tex] 67.25 × 85.91 ÷ 100 57.774475
Type 2 [tex]{}[/tex] 32.75 × 87.91 ÷ 100 28.790525
[tex]{}[/tex] Average atomic mass = 86.565
The average atomic mass = 86.565.
