We’re being asked to determine which between boron-10 or boron-11 is more abundant.
We can use the following equation:
atomic mass = average atomic mass of the element
f.a. = fractional abundance of the isotope.
To get f.a., we simply need to divide the given percent abundance by 100.
We’re given the following values:
Average Atomic Mass = 10.81 amu
Boron-10: Mass = 10.013 amu
Boron-11: Mass = 11.009 amu
Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron -10 and boron -11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which isotope of boron is more abundant, boron-10 or boron-11?
c. cannot be determined from data given
d. neither, their abudances are the same.
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