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.
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 (%)|
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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