The rate constant for the radioactive disintegration of Co is 0.1317 ycai’. Calculate the mass of Co that will remain after 21.04 years out of I gram sample.

To determine the remaining mass of Cobalt-60 (Co) after a certain period of radioactive decay, we can use the first-order radioactive decay equation:

\[ N(t) = N_0 \cdot e^{-kt} \]

where:
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