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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.

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 e class=

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A correct option is an option (b)

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

average atomic mass = [tex](220.90 \times \frac{74.22}{100} ) + (220.00 \times\frac{ 12.78}{100} ) + (218.10 \times\frac{ 13.00}{100} )[/tex]

average atomic mass =[tex]138.880 + 51.106 + 30.316[/tex]

average atomic mass = [tex]220.40 amu[/tex]

A correct option is an option (b)

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