Chemistry Isotopes Solution: Gallium consists of 2 isotopes. One of those isoto...

Solution: Gallium consists of 2 isotopes. One of those isotopes is Ga-71 with a mass of 70.92 amu with an abundance of 39.892%. What is the mass number of the other isotope?

Problem

Gallium consists of 2 isotopes. One of those isotopes is Ga-71 with a mass of 70.92 amu with an abundance of 39.892%. What is the mass number of the other isotope?

Solution

We’re being asked to calculate the mass number of the other isotope of Gallium-70 (Ga-70)

We can use the following equation:


Atomic Mass=[mass×f.a.]isotope 1+[mass×f.a.]isotope 2

where:

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.


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