Boron has two isotopes b-10 and b-11 whose percentage abundance are 19.6% and 80.4% respectively? What is the average atomic mass of boron?
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average atomic mass= sum of (abundance X isotopic mass)/100
=19.6x10+80.4x11/100
=10.804
=19.6x10+80.4x11/100
=10.804
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