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15 May, 11:22

u are given a 30.0g sample of radioactive uranium that has a half-life of 12 hours. How much uranium will be left after 2 days? 1Choice 1 3.75g 2Choice 2 15.0g 3Choice 3 60.0g 4Choice 4 1.88g

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Answers (2)
  1. 15 May, 11:28
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    Answer:choice 4
  2. 15 May, 11:51
    0
    1.88 g

    Explanation:

    We are given;

    Mass of a radioactive sample of Uranium as 30.0 g Half life of Uranium sample is 12 hours Time is 2 days

    We are required to determine the amount of uranium left after 2 days

    We are going to use the formula;

    N = N₀ * 0.5^n

    Where, N is the remaining mass, N₀ is the original mass and n is the number of half lives.

    n = (2 * 24) : 12 hours

    = 4

    Therefore;

    Remaining mass, N = 30.0 g * 0.5^4

    = 1.875 g

    = 1.88 g

    Therefore, the mass of the remaining sample after decay is 1.88 g
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