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the percent abundance of each isotope of chlorine

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Chlorine has two naturally occuring isotopes, 35 Cl (isotopic mass 34.9689 amu) and 37Cl (isotopic mass 36.9659 amu). If chlorine has an atomic mass of 35.4527 amu, what is the percent abundance of each isotope?

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It shows how to find the the percent abundance of each isotope of Chlorine given its atomic mass.

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Assume the percentage of 35Cl is x, then
atomic mass = isotopic ...

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