Boron has primarily two isotopes, one with an atomic mass of 11 amu and another with an atomic mass of 10 amu. If the abundance of the boron atom with a mass of 11 amu is 18.9 percent and the abundance of the other isotope is 81
1 percent, what would be the average mass of the boron atom? A) 10.19 amu
B) 11 amu
C) 10 amu
D) 10.81 amu
E) not enough information given
A
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Fill in the blank(s) with the appropriate word(s).