An element has two isotopes, and . The average atomic mass is 35.5. The percentage abundance of is : | Mole Concept and Some Basic Concepts of Chemistry — Chem-Mantra

Question

An element $X$ has two isotopes, $^{35}X$ and $^{37}X$. The average atomic mass is 35.5. The percentage abundance of $^{35}X$ is :

Answer: A

💡 Solution & Explanation

Let $\%$ of $^{35}X$ be $a$. <br>$35.5 = [a(35) + (100-a)(37)] / 100 \Rightarrow 3550 = 35a + 3700 - 37a \Rightarrow 2a = 150 \Rightarrow a = 75\%$.

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