Project Of Christopher Boo

Chemistry Level 2

There are two rubidium isotopes occurring in nature: Rb85\text{Rb}^{85}, which has a molar mass of 84.9184.91, and Rb87\text{Rb}^{87}, whose molar mass is 86.9286.92. The atomic mass of rubidium is 85.4785.47. What is the percentage of Rb87\text{Rb}^{87} out of the total existing Rb?\text{Rb}?

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