Question

The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu.

Answer 1

A correct option is an option (b)

average atomic mass = sum of masses of individual isotopes x natural abundance

average atomic mass = $(220.90 \times \frac{74.22}{100} ) + (220.00 \times\frac{ 12.78}{100} ) + (218.10 \times\frac{ 13.00}{100} )$

average atomic mass =$138.880 + 51.106 + 30.316$

average atomic mass = $220.40 amu$

A correct option is an option (b)

Learn More:https://brainly.com/question/13241760