Subjective Type

What is the average atomic mass of silicon?

Solution

Multiply the amu by the percentage of occurrence to arrive at an average atomic mass of $$28.0891$$.
Explanation:
We take the amu of each isotope, multiply it by the percentage of occurrence, and end up with a weighted average:
$$27.9769*0.9218+28.9765*0.0471+29.9738*0.0312$$ (quick note - there is a bit of rounding in here - the abundance percentages add up to $$1.01$$, so the number we calculate is going to be slightly off).
This simplifies to:
$$25.7891+1.3648+0.9352=28.0891$$


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