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The half life of a certain radioactive substance is 24 days. Given that the initial sample of the substance has a mass of 64 g, determine the mass which is left after 72 days.

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64      →    32    →     16      →       8
    24 days      48days      72 days  
3 half lives, 8g left
alternatively, 
64 x (1/2)3 

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