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nuclear……?

If 0.233 g of a radioisotope remained after four half-lives, then the original mass was _________ g.

please help

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2 Responses to “nuclear……?”

  1. jcann17_2002 said :

    This is just doubling 4 times (4 half lives)
    Therefore 3.728 g
    1.864 (1 hl)
    .932 (2 hl)
    .466 (3 hl)
    .233 (4hl)

  2. ajay2589 said :

    0.233 after 4 half lives

    0.233 X 2 3 h l

    .233 X2 X 2 2 hl

    .233 X 2 X 2 X 2 1 hl

    .233 X 16 original amount

    So original amount is 3.728 grams




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