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680 g of sodium 24 was placed in a container to decay if there is now 85 g of sodium 24 left how long has the sodium been decaying

1 Answer

6 votes

Answer:44.7 hours.

Step-by-step explanation:

The time taken for the radioactivity of a specified isotope to fall to half its original value is called half life of that radioactive material.

Half life of sodium-24 is
14.9 hours.

Initial amount of sodium-24 is
680g

In
14.9 hours,the quantity falls to
(680)/(2)=340g

In another
14.9 hours,the quantity falls to
(340)/(2)=170g

In another
14.9 hours,the quantity falls to
(170)/(2)=85g

So,it takes
14.9+14.9+14.9=44.7 hours for the quantity to become
85g.

User Ialphan
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