What is the average atomic mass for the mixture that is 75% ""^133Cs133Cs, 20% ""^132Cs132Cs, 5% ""^134Cs134Cs?

1 Answer
Dr. Hayek
Apr 11, 2016

"Average atomic mass" =132.85 a.m.u.Average atomic mass=132.85a.m.u.

Explanation:

The average atomic mass could be found by:

"Average mass" = sum ("Abundance percentage"xx"isotope mass")Average mass=∑(Abundance percentage×isotope mass)

=>"Average mass" =(0.75xx133)+(0.20xx132)+(0.05xx134)=132.85 a.m.u.⇒Average mass=(0.75×133)+(0.20×132)+(0.05×134)=132.85a.m.u.

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