Calculating average atomic mass

  • Thread starter Akshath
  • Start date
  • #1
2
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Main Question or Discussion Point

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 .
 

Answers and Replies

  • #2
21
2
0.9225*28 + 0.0465*29 + 0.0310*30 = 28.1085
 
  • #3
2
0
Thanx. This holds good for all elements ( to calculate average atomic mass of Isotopes) ?
 
  • #4
Borek
Mentor
28,402
2,801
Yes, average atomic mass is always a weighted average.
 

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