An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.48 amu. What is the percent abundance of ¹²²X?

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter3: Stoichiometry
Section: Chapter Questions
Problem 15ALQ: Chlorine exists mainly as two isotopes, 37Cl and 33Cl. Which is more abundant? How do you know?
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An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.48 amu. What is the percent abundance of ¹²²X?

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