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

24-12-2017

the substance has completed 3 half lives.

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