Asked by Anonymous

the element boron has two naturally occurring isotopes with masses of 10.01amu and 11.01amu. What is the percent abundance of the first isotope.
Answered by bobpursley
You have to know the average atomic mass of boron....look at the periodic table to get that.

Now, the math...

avgatomicmass*100=10.01*P + 11.01*(100-P)

solve for P.
Answered by jo
10.81 amu
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