Question: Suppose that fictional element X has an average atomic mass of 74.662u. Element X has two isotopes. One isotope has a mass of 72.945u and

Suppose that fictional element X has an average atomic mass of

Suppose that fictional element X has an average atomic mass of 74.662u. Element X has two isotopes. One isotope has a mass of 72.945u and a percent abundance of 20.11%. Calculate the mass of the second isotope

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