Answer: The average atomic mass of naturally occurring silicon is 28.08
Explanation:
Mass of isotope Si-28 = 27.9769265327
% abundance of isotope Si-28 = 92.2297% = ![\frac{92.2297}{100}](https://tex.z-dn.net/?f=%5Cfrac%7B92.2297%7D%7B100%7D)
Mass of isotope Si-29 = 28.97649472
% abundance of isotope Si-29 = (4.6932)% = ![\frac{4.6832}{100}](https://tex.z-dn.net/?f=%5Cfrac%7B4.6832%7D%7B100%7D)
Mass of isotope Si-30 = 29.97377022
% abundance of isotope Si-30 = (3.0872)% = ![\frac{3.0872}{100}](https://tex.z-dn.net/?f=%5Cfrac%7B3.0872%7D%7B100%7D)
Formula used for average atomic mass of an element :
![A=\sum[(27.9769265327\times \frac{92.2297}{100})+(28.97649472\times \frac{4.6832}{100})+(29.97377022\times \frac{3.0872}{100})]](https://tex.z-dn.net/?f=A%3D%5Csum%5B%2827.9769265327%5Ctimes%20%5Cfrac%7B92.2297%7D%7B100%7D%29%2B%2828.97649472%5Ctimes%20%5Cfrac%7B4.6832%7D%7B100%7D%29%2B%2829.97377022%5Ctimes%20%5Cfrac%7B3.0872%7D%7B100%7D%29%5D)
![A=28.08](https://tex.z-dn.net/?f=A%3D28.08)
Therefore, the average atomic mass of naturally occurring silicon is 28.08