Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 3 - Stoichiometry - Exercises - Page 128: 40


$$^{28}Si \quad 27.98 \quad 92.21 \%$$ $$^{29}Si \quad 28.9 \quad 4.70\%$$ $$^{30}Si \quad 29.97 \quad 3.09\%$$

Work Step by Step

Abundance of $^{28}Si$ = 100%-3.09%-4.70%= 92.21 % We refer to the periodic table to determine the average atomic mass of Si. Let m be the atomic mass of $^{29}Si$: $28.085=0.9221*27.98+0.0470*m+0.0309*29.97$ $m=\frac{28.085-0.9221*27.98-0.0309*29.97}{0.0470}=28.9$
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