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29 April, 22:11

02:59:56

A 60.0-g sample of fermium-253 was placed in a sealed vessel 9.0 days ago. Only 7.5 g of this isotope is now left. What is the

half-life of fermium 253?

3.0 days

4.5 days

17.5 days

20.0 days

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Answers (1)
  1. 30 April, 01:43
    0
    Half life = 3 days

    Explanation:

    Given dа ta:

    Original amount = 60 g

    Amount left after 9 days = 7.5 g

    Half life of fermium-253 = ?

    Solution:

    At time 0 = 60 g

    At 1st half life = 60 g/2 = 30 g

    At 2nd half life = 30 g / 2 = 15 g

    At 3rd half life = 15 g/2 = 7.5 g

    Half life = T elapsed / number of half lives

    Half life = 9 days / 3

    Half life = 3 days
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