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Chemistry Level 1

There are two rubidium isotopes occurring in nature: \(\text{Rb}^{85}\), which has a molar mass of \(84.91\), and \(\text{Rb}^{87}\), whose molar mass is \(86.92\). The atomic mass of rubidium is \(85.47\). What is the percentage of \(\text{Rb}^{87}\) out of the total existing \(\text{Rb}?\)

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Gabriel Merces by Gabriel Merces
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