14. Silicon has the following three isotopes: 27.977 amu - 92.23% (Si-28) 28.976 amu - 4.68% (Si-29) 29.974 amu - 3.09% (Si-30) Calculate the weighted average atomic mass of this element. a. 28.08 amu b. 29.00 amu c. 27.05 amu d. 25.06 amu e. 30.08 amu
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977 \times 0.9223 + 28.976 \times 0.0468 + 29.974 \times 0.0309 \] Show more…
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5.6 Silicon consists of three isotopes with the following percent abundances: Isotope | Exact Mass (amu) | Percent Abundance (%) 28Si | 27.976926 | 92.18 29Si | 28.976495 | 4.70 30Si | 29.973770 | 3.12 Calculate the average atomic mass of silicon.
Sri K.
Silicon is widely used in the semiconductor industry. Its isotopes and abundances are: $\mathrm{Si}-28$ $\begin{array}{ll}27.977 \mathrm{amu} & 92.34 \%\end{array}$ $\begin{array}{lll}\mathrm{Si}-29 & 28.977 \mathrm{amu} & 4.70 \% \\ \mathrm{Si}-30 & 29.974 \mathrm{amu} & 2.96 \%\end{array}$ What is the average atomic mass of silicon?
Silicon has three naturally occurring isotopes: $92.23 \%$ of ${ }^{28} \mathrm{Si}$, with an atomic weight of $27.9769$ amu; $4.68 \%$ of ${ }^{29} \mathrm{Si}$, with an atomic weight of $28.9765 \mathrm{amu} ;$ and $3.09 \%$ of ${ }^{30} \mathrm{Si}$, with an atomic weight of $29.9738$ amu. On the basis of these data, confirm that the average atomic weight of $S i$ is $28.0854 \mathrm{amu}$.
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