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I am supposed to find the percent abundancies of two isotopes. I am given the masses of both isotopes, along with the atomic mass. (This is a fictional element with only those two isotopes.) I am not given percentages for either isotope... how do I solve this?

  • Chemistry - ,

    Well, if the Percent of A is A, then the percent of B is 1-A (decimal percents.)

    avgatomicmass=massA*precentA + massB(1-percentA)
    solve for percent of A.

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