bigboydenny913 bigboydenny913
  • 14-12-2017
  • Chemistry
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A 806.3 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. after 47 days the amount of radioactive substance had decreased to 100.8 ng. how many half-lives of the unknown radioactive substance have occurred?

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hadiyababarp1gose
hadiyababarp1gose hadiyababarp1gose
  • 24-12-2017
the substance has completed 3 half lives.
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