Answer :
After 106 minutes, the amount of the iodine left is:
R = 54,544g/4 = 13,636 grams
How much will be left after 106 minutes if its half-life is 53 minutes?
For a radioactive element, the half-life is the time in which the initial amount of the element is reduced to its half.
Here the half-life is 53 minutes, then 106 minutes is equivalent to two half-lifes.
This means that after that time, the amount of the iodine is reduced to its half two times (so its reduced to a fourth of the initial amount).
Here the initial amount is 54,544 grams, so after 106 minutes we will have:
R = 54,544g/4 = 13,636 grams
If you want to learn more about half-life:
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