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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