Problem: Germanium has five naturally occurring isotopes: 70 Ge, 20.5%, 69.924 amu; 72 Ge, 27.4%, 71.922 amu; 73 Ge, 7.8%, 72.923 amu; 74 Ge, 36.5%, 73.921 amu; and 76 Ge, 7.8%, 75.921 amu.What is the atomic weight of germanium?

FREE Expert Solution

We’re being asked to calculate the atomic weight of germanium


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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Problem Details

Germanium has five naturally occurring isotopes: 70 Ge, 20.5%, 69.924 amu; 72 Ge, 27.4%, 71.922 amu; 73 Ge, 7.8%, 72.923 amu; 74 Ge, 36.5%, 73.921 amu; and 76 Ge, 7.8%, 75.921 amu.

What is the atomic weight of germanium?

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