# Problem: Assume that potassium (atomic mass = 39.10) has only two isotopes, one of which is potassium-39 (isotopic mass = 38.9637 amu, abundance = 93.258%). What is the mass of the second isotope? A. 43.06 amu B. 40.95 amu C. 42.05 amu D. 39.97 amu E. 41.88 amu

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###### Problem Details

Assume that potassium (atomic mass = 39.10) has only two isotopes, one of which is potassium-39 (isotopic mass = 38.9637 amu, abundance = 93.258%). What is the mass of the second isotope?

A. 43.06 amu

B. 40.95 amu

C. 42.05 amu

D. 39.97 amu

E. 41.88 amu

What scientific concept do you need to know in order to solve this problem?

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