Rubidium has two naturally occurring isotopes, 85Rb (relative mass 84.9118amu) and 87Rb (relative mass 86.9092amu). If rubidium

Question

Rubidium has two naturally occurring isotopes, 85Rb (relative mass 84.9118amu) and 87Rb (relative mass 86.9092amu). If rubidium has an average atomic mass of 85.47amu, what is the abundance of each isotope (in percent) - show work?

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