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7th grade

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Radon-22 has a half life of 4 days. If you begin with 32 grams of radon, how many grams will be left after 20 days?

  • 7th grade -

    20 days is 5 half-lives.

    Divide 32 by two, five times.

    That is the same as dividing 32 by 2^5.

  • 7th grade -

    thank you drwls for the help

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