🤓 Based on our data, we think this question is relevant for Professor Morkowchuk's class at UVA.
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.
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