An environment study showed that the Chernobyl disaster released 6.0 MCi of 137 Cs into the environment. The mass of 137 Cs released is .... × 10 kg. The half life of 137 Cs is 30.2 years.
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(7)
The activity of a sample is
one mole of 
has a mass 137 g and one mole has 
nuclei. Thus the mass of 
released was
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