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Naturally occurring cobalt consists of only one isotope, 59Co , whose relative atomic mass is 58.9332. A synthetic radioactive isotope of cobalt, 60Co , relative

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 1.8742 g sample of cobalt has an apparent "atomic mass" of 58.9901. Find the mass of 60Co in this sample.

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