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1 June, 04:25

3.) A 208 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 hours.

What is the half-life of this

radioactive isotope?

121 in

10 day how long will it take a 50.00 g sample t

+5
Answers (1)
  1. 1 June, 04:35
    0
    Half life = 12 hrs

    Explanation:

    Given dа ta:

    Total amount of sample = 208 g

    Amount left after 60 hr = 13.0 g

    Half life = ?

    Solution:

    Step one:

    amount half life

    208 g time 0

    208/2 1 half life

    104/2 2 half life

    52/2 3 half life

    26/2 4 half life

    13 5 half life

    Step 2:

    half life = elapsed time / total half life when 13 g is left

    Half life = 60 hrs / 5

    Half life = 12 hrs
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