We’re being asked to to determine the mass of Ga-71. We can use the following equation:
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.
Gallium has two naturally occurring isotopes: Ga-69 with a mass of 68.9256 amu and a natural abundance of 60.11 %, and Ga-71. Use the atomic mass of gallium listed in the periodic table to determine the mass of Ga-71.
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