Problem: What is the average atomic mass of silicon? Given the following data, calculate the average atomic mass of silicon.isotope = Si-28amu =27.9769abundance(%) =92.18isotope = Si-29amu =28.9765abundance(%) =4.71isotope =Si-30amu =29.9738abundance(%) =3.12

FREE Expert Solution

We’re being asked to calculate the average atomic mass of Silicon (Si). We can use the following equation:


Atomic mass = mass × f.a.isotope1 + mass × f.a.isotope2+ mass × f.a.isotope3


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.

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Problem Details

What is the average atomic mass of silicon? Given the following data, calculate the average atomic mass of silicon.

isotope = Si-28
amu =27.9769
abundance(%) =92.18

isotope = Si-29
amu =28.9765
abundance(%) =4.71

isotope =Si-30
amu =29.9738
abundance(%) =3.12

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