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i dont know how to work this!!! please help!!!

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an mixture of isotopes for an element contains 22% of atomic mass of 159.3 amu and 78% of atomic mass of 161.2 amu. what is the average atomic mass?

Oct 19th, 2017

here you multiply  individual percentage atomic mas by amu and divide by 100

(22x159.3)+(78x161.2)

=16078.2

diving by 100

16078.2/100

=160.782  this the average  atomic mass

Oct 26th, 2014

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