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Tritium (H-3) is a radioactive isotope of hydrogen with a half-life of 12.3 years. How long would it take for a 40.0g sample to decay down to 1.25g

Answer :

Answer:

the answer maybe is 61.5 years (please check with others) tq

Explanation:

40/2=20

20/2=10

10/2=5

5/2=2.5

2.5/2=1.25

so one half life is 12.3 years

then 12.3 ×5 =61 .5

(why 5 ? because it decay 5 times to get 1.25 from 20)

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