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chemistry

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A particular radioactive substance has a half-life of 4 minutes. How long will it take for 250 g of this radioactive material to decay to less than 0.1g?
24 min
36 min
40 min
48 min
72 min

I got 32 min but that not one of the choices. Please help

  • chemistry -

    How many half lives does it go through to get from 250 g to < 0.1g?
    # half lives x 4 min = ?

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