Use the formula of atomic mass to determine the atomic mass of Y:
atomic mass = average atomic mass of the element
f.a. = fractional abundance of the isotope.
To get f.a., simply need to divide the given percent abundance by 100.
There are two isotopes of Y, 50Y (mass 49.972 amu, abundance 24.93%), 52Y (mass 51.966 amu). The atomic mass of Y in amu is what?
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