chemistry

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there are two naturally occurring isotopes of the element zinc. the relative abundance and mass of each are as follow
64
30zn=48.89% 63.929 amu

66
30zn=27.81% 65.926

is it 0.4889(63.929)+027.81(65.926) divide by 2?

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What else is in the naturally occuring zinc, the abundance of the two isotopes combined is only 76 percent (about) by adding 48.9+27.8 . Something else has to be there.

Dont divide by two, you will divide by 1.0 (the sum of the abundances, hopefully 100 precent or 1.0). But something is missing here.

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