Calculating average atomic mass

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The discussion focuses on calculating the average atomic mass of silicon using its isotopes' relative abundances. The isotopes are Si(28) at 92.25%, Si(29) at 4.65%, and Si(30) at 3.10%. The calculation method involves multiplying the abundance of each isotope by its mass and summing the results, leading to an average atomic mass of approximately 28.11 u. It is confirmed that this method of calculating average atomic mass as a weighted average applies to all elements.
Akshath
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The relative abundance of various isotopes of silicon is as Si(28) = 92.25%, Si(29) = 4.65% and Si(30) = 3.10 % . Calculate the average atomic mass of Silicon.

Ans : 28.11 u

Attempt. : I don't know how to start this problem .
 
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0.9225*28 + 0.0465*29 + 0.0310*30 = 28.1085
 
Thanx. This holds good for all elements ( to calculate average atomic mass of Isotopes) ?
 
Yes, average atomic mass is always a weighted average.
 

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