Problem: There are two naturally occurring isotopes of rubidium. 85Rb has a mass of 84.9118 amu. 87Rb has a mass of 86.9092 amu. Determine the abundance of each isotope. 

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There are two naturally occurring isotopes of rubidium. 

85Rb has a mass of 84.9118 amu. 

87Rb has a mass of 86.9092 amu. 

Determine the abundance of each isotope.