# Problem: Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). Masses and natural abundances for two isotopes are listed here.IsotopeMass (amu) Abundance (%)Si-2827.976992.2Si-2928.97654.67Si-30??You may want to reference (Pages 66 - 69) Section 2.8 while completing this problem.Find the atomic mass of Si-30 .

###### FREE Expert Solution

We’re being asked to determine the mass of Si-30. 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.

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###### Problem Details

Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). Masses and natural abundances for two isotopes are listed here.

 Isotope Mass (amu) Abundance (%) Si-28 27.9769 92.2 Si-29 28.9765 4.67 Si-30 ? ?

You may want to reference (Pages 66 - 69) Section 2.8 while completing this problem.

Find the atomic mass of Si-30 .

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What scientific concept do you need to know in order to solve this problem?

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