Naturally occurring silicon exists as three isotopes. 92.23% is Si-28 with a mass of 27.977 amu, 4.67% is Si-29 with a mass of 28.977 amu, and 3.10% is Si-30 with a mass of 29.974 amu. What is the atomic mass of silicon?
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9223 \times 27.977 = 25.7867 \, \text{amu}\] ** Show more…
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Silicon has three naturally occurring isotopes: Si-28 with mass 27.9769 amu and a natural abundance of $92.21 \%, \mathrm{Si}-29$ with mass 28.9765 amu and a natural abundance of $4.69 \%$ and Si-30 with mass 29.9737 amu and a natural abundance of $3.10 \% .$ Calculate the atomic mass of silicon.
Henry H.
The average atomic weight of silicon is 28.086 amu. The three naturally occurring isotopes of silicon have the following masses: 29 Si 27.977 amu; $^{29} \mathrm{Si}, 28.976 \mathrm{amu} ;^{30} \mathrm{Si}, 29.974 \mathrm{amu}$ with a percent abundance of $3.09 \%$. Calculate the percent abundance of $^{25} \mathrm{Si}$ and $^{29} \mathrm{Si}$ in naturally occurring silicon.
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