Boron has primarily two isotopes one withatomic mass of 11, Ask an Expert

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Boron has primarily two isotopes one withatomic mass of 11 amu and the other with an atomic mass of 10 amu.if the abundances of the boron atom with a mass of 11 amu is 18.9%and the abundance of the other isotope is 81.1% what would be the average mass of the boron?

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