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The fictional element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The

The fictional element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu.

^Isotope	^{Abundance (%)}	^Mass
⁹¹X	74.22	91.91
⁹⁰X	12.78	90.02
⁸⁸X	13.00	88.11

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