Chemistry, 02.11.2020 20:10, gonzaloc

Element X has two isotopes. If 72.0% of the element has an isotopic mass of 84.9 atomic mass units, and 28.0% of the
element has an isotopic mass of 87.0 atomic mass units, the
average atomic mass of element X is numerically equal to
o (72.0 - 84.9) (28.0 + 87.0)
o (72.0 x 84.9) + (28.0 x 87.0)
o (72.0 + 84.9) (28.0 + 87.0)
o (72.0 x 84.9) (28.0 x 87.0)
+
100
100

Answers: 3

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Element X has two isotopes. If 72.0% of the element has an isotopic mass of 84.9 atomic mass units,...