Solution:
Let X be the relative abundance of the isotope with relative mass 63.0. Then the relative abundance of the 65.0 isotope is (1-X). Thus:
The relative abundance of the isotope with mass 63.0 is . Therefore, the relative abundance of the 65.0 isotope is .
Answer:
The relative abundance of the isotope with mass 63.0 is . Therefore, the relative abundance of the 65.0 isotope is .
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