If a radioactive sample starts with 100 g, how many grams of the original substance will be left after 5 half lives?  show work please?

20 g

50 g

3.125 g

12.5 g

3 Answers

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  • 4 months ago
    Favourite answer

    (1/2)^5 = 0.03125 (decimal amount remaining after 5 half-lives)

    100 g * 0.03125 = 3.125 g remaining after 5 half-lives

  • 4 months ago

    x = 100 * (1/2)^5

    x = 100 * 1/32

    x = 3.125g

  • Bryce
    Lv 7
    4 months ago

    100*(1/2)^5= 3.125 g

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