9. A hypothetical element (Engineerium, En) has 2 stable isotopes: $^{123}En$ and $^{125}En$. If the average atomic weight of En is 124.27 amu, what is the isotopic abundance of each of the stable isotopes? (10)
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Step 1: Let $x$ be the abundance of $^{123}$En and $1-x$ be the abundance of $^{125}$En. Show more…
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