Calculating average atomic mass

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Discussion Overview

The discussion revolves around the calculation of the average atomic mass of silicon based on the relative abundances of its isotopes. It includes mathematical reasoning and clarification of concepts related to isotopic averages.

Discussion Character

  • Mathematical reasoning, Conceptual clarification

Main Points Raised

  • One participant presents the relative abundances of silicon isotopes and expresses uncertainty about how to start the calculation.
  • Another participant provides a calculation for the average atomic mass using the given abundances and isotopic masses, arriving at a value of 28.1085 u.
  • A question is raised about whether the method used for calculating average atomic mass applies to all elements.
  • A response confirms that the average atomic mass is always a weighted average.

Areas of Agreement / Disagreement

Participants generally agree on the method of calculating average atomic mass as a weighted average, but there is no consensus on the applicability of the method to all elements as the discussion does not explore this further.

Contextual Notes

The discussion does not address potential limitations or assumptions in the calculation method or the definitions of isotopes and average atomic mass.

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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