Chemistry

Question Analysis
This question involves calculating the percent abundance of a specific isotope (Cl-37) using the element’s average atomic mass and two isotope masses.
The main focus is on setting up and solving a linear algebraic equation for isotope abundances.

Key Concept Explanation
For two isotopes: Let = % abundance of isotope 1, isotope 2 = %.
Average atomic mass = (mass₁× ) + (mass₂× ).

Step-by-Step Solution
1. Let = % abundance of Cl-35, Cl-37 = %
2. Equation:
3. Multiply by 100:

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