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 Chemistry Question

💡 Solution & Explanation

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