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An element has two naturally occurring isotopes (Y-79 and Y-81) and an atomic mass of 79

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An element has two naturally occurring isotopes (Y-79 and Y-81) and an atomic mass of 79.904 amu.  The mass of Y-81 is 80.9163 amu and its natural abundance is 49.31%.  Calculate the mass and natural abundance of the other isotope.
Naming binary compounds - 1 point each