Chemistry, 05.12.2019 21:31, aliviafrancois2000

An unknown radioactive substance has a half-life of 3.20 hours . if 22.8 g of the substance is currently present, what mass a0 was present 8.00 hours ago? express your answer with the appropriate units.

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An unknown radioactive substance has a half-life of 3.20 hours . if 22.8 g of the substance is curre...