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27-02-2024
Chemistry

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Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium?
a) 85.0
b) 86.5
c) 87.0
d) 87.5

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