Question: Natural rubidium has the average mass 85 4678 amu and is
Natural rubidium has the average mass 85.4678 amu and is composed of isotopes 85Rb (mass 5 84.9117 amu) and 87Rb. The ratio of atoms 85Rb/ 87Rb in natural rubidium is 2.591. Calculate the mass of 87Rb.
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