An unknown element with atomic weight 125.8 amu has two isotopes. One isotope has an abundance of 51.97% at 125.6 amu. Find the mass of the second isotope.
E. Over 9000
Determine the mass of the second isotope of an unknown element with a weight of 125.8 amu where the other isotope has 51.97% at 125.6 amu using the formula for atomic mass
where atomic mass = average atomic mass of the element and f.a. = fractional abundance of the isotope. To get f.a., we simply need to divide the given percent abundance by 100.