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I know the answer is 5.21E-7 but don't know how to get that answer ! Required information Radioactive iodine, I , is used in some

I know the answer is 5.21E-7 but don't know how to get that answer

! Required information Radioactive iodine, I , is used in some forms of medical diagnostics. The half-life of I is 8.0252 days. If the initial activity of a sample is 64.7 mCi, what is the mass of I in the sample

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