Unformatted text preview: There are only three isotopes. The fractional abundance of the 29 Si isotope is given: 0.04685. The atomic weight of Si is 28.0855 u Isotope Mass Fractional abundance 28 Si 27.976926 u ? 29 Si 28.976494 u 0.04685 30 Si 29.973770 u ? Answer: fraction 28 Si = 0.9222 ( or, 92.22 %)...
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This note was uploaded on 02/24/2011 for the course CHEM 103 taught by Professor Stafcas during the Fall '10 term at Penn State.
 Fall '10
 stafcas
 Atom, Atomic Mass, Isotopes

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