. A sample of 4 g of cobalt isotope is produced. If the half-life of is 30 years, what will be the mass of the cobalt remaining after 90 yea

Question

. A sample of 4 g of cobalt isotope is produced. If the half-life of is 30 years, what will be the mass of the cobalt remaining after 90 years?

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Thu Giang 4 years 2021-08-22T00:33:28+00:00 1 Answers 76 views 0

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  1. bonexptip
    0
    2021-08-22T00:34:45+00:00
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    Answer:

    Half Life = 90/30 = 3 Half lives

    Half Life = 30 years

    So,

    4 g Cobalt after 30 years = 4/2

    => 2 g

    2 g Cobalt after next 30 years = 2/2

    => 1 g

    1 g Cobalt after next 30 years = 1/2

    => 0.5 g

    So, After 90 years, 0.5g of cobalt isotope will be left.

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