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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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Project Of Christopher Boo

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.