Mass of Co-59 = 58.9332
Mass of Co-60 = 59.9338
Naturally occurring cobalt consists of only one isotope, 59Co, whose relative atomic mass is 58.9332. A synthetic radioactive isotope of cobalt, 60Co, relative atomic mass 59.9338, is used in radiation therapy for cancer. A 1.7222 g sample of cobalt has an apparent "atomic mass" of 58.9901.
Find the mass of 60Co in this sample.
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