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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