Percentage of krypton remaining

label Chemistry
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krypton-85 has a half life of 10 years. What percentage of 85kr produced from nuclear testing in 1959 still remains today?

Aug 31st, 2015

Thank you for the opportunity to help you with your question!

To solve this problem, you can use a 'half-life' equation:

Af=final amount

Ai=initial amount=85u

t=amount of time that passed=2015-1959=56 years

h=half-life=10 years

Af=Ai*(2)^(-t/h)

Af=85*(2)^(-56/10)

Af=1.752u

Now you can calculate the percentage remaining (Pr)=?

Pr=Af/Ao=1.752/85=2.06%



Please let me know if you need any clarification. I'm always happy to answer your questions.
Aug 31st, 2015

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