# Problem: Rubidium (Rb) has only two naturally occurring isotopes. The first isotope has a mass of exactly 86.909 amu and the second isotope has a percent abundance of 72.17%. What is the mass of the second isotope in amu? a. 83.99 g/mol b. 84.91 g/mol c. 85.49 g/mol d. 85.49 g/mol e. 84.91 g/mol

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Rubidium (Rb) has only two naturally occurring isotopes. The first isotope has a mass of exactly 86.909 amu and the second isotope has a percent abundance of 72.17%. What is the mass of the second isotope in amu?

a. 83.99 g/mol

b. 84.91 g/mol

c. 85.49 g/mol

d. 85.49 g/mol

e. 84.91 g/mol

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