The average atomic mass of the element is 17.20 amu. This is calculated using the relative abundances and atomic masses of its isotopes.
In order to calculate the average atomic mass of the element, we need to multiply the relative atomic mass of each isotope by its abundance, and then add them up.
So, for isotope ¹⁵X:
15.33 amu * 0.286 = 4.38 amu
For ¹⁷X:
17.26 amu * 0.133 = 2.30 amu
And for ¹⁸X:
18.11 amu * 0.581 = 10.52 amu
Now, finally, we add these up to get the average atomic mass of element X:
4.38 amu + 2.30 amu + 10.52 amu = 17.20 amu
You can learn more about the average atomic mass here:
brainly.com/question/13753702
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