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OpenStudy (anonymous):
Calculate the average atomic mass of rubidium. Rubidium has two isotopes, 85Rb and 87Rb. 85Rb has an atomic mass of 84.912 amu and occurs at an abundance of 72.17%. 87Rb has an atomic mass of 86.909 amu and occurs at an abundance of 27.83%. Show your work.
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OpenStudy (anonymous):
Simple weighted average: (0.7217)(84.912) + (0.2783)(86.909)
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