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A fictional element has two isotopes. Isotope 1 has a mass of 70.0 amu and a...

A fictional element has two isotopes. Isotope 1 has a mass of 70.0 amu and a relative abundance of 80.28%.
Isotope 2 has a mass of 87.0 amu.
Find the relative abundance (%) of Isotope
Calculate the average atomic mass of the fictional element.

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