Rubidium Has Two Naturally Occurring Isotopes

question 17

Multiple Choice

Rubidium has two naturally occurring isotopes.The average mass of Rb is 85.4678 amu.If 72.15% of Rb is found as Rb-85 (84.9117 amu) ,what is the mass of the other isotope?

• A) 0.56 amu
• B) 85.68 amu
• C) 86.91 amu
• D) 86.02 amu
• E) 83.47 amu

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