We can use the following equation to calculate the atomic mass:
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.
A certain element has 2 naturally occurring isotopes with the masses and natural abundances shown below. Calculate the atomic mass of the element.
Isotope - 1 78.925 amu, 60.11 %
Isotope - 2 80.925 amu, 39.86 %
A) 79.70 amu
B) 79.93 amu
C) 80.00 amu
D) 79.80 amu
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