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

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