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September 17, 2014

September 17, 2014

Posted by **Anonymous** on Monday, December 5, 2011 at 2:53pm.

24 min

36 min

40 min

48 min

72 min

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

- chemistry -
**DrBob222**, Monday, December 5, 2011 at 3:28pmHow many half lives does it go through to get from 250 g to < 0.1g?

# half lives x 4 min = ?

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