Asample of element x contains 90% x-35 atoms, 8.0% x-37 atoms, and 2.0% x-38 atoms. the average atomic mass will be closest to which value?

Answer : The average atomic mass will be closest to 35 amu.

Explanation :

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

As we are given that,

Mass of isotope X-35 = 35 amu

Percentage abundance of isotope X-35 = 90 %

Fractional abundance of isotope X-35 = 0.90

Mass of isotope X-37 = 37 amu

Percentage abundance of isotope X-37 = 8.0  %

Fractional abundance of isotope X-37 = 0.08

Mass of isotope X-38 = 38 amu

Percentage abundance of isotope X-38 = 2.0  %

Fractional abundance of isotope X-38 = 0.02

Now put all the given values in above formula, we get:

Therefore, the average atomic mass will be closest to 35 amu.

where's the diagram?

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