If the half-life of iodine-131 is 8.0 days, how much of a 100.0 mg sample of it will remain after 32 days? In case you're interested, iodine-131 forms xenon-131 by beta emission/decay. Please enter only a numerical answer and do not write in any units. It is understood that the unit is mg.

Given :

Half-life of Iodine , .

Initial concentration , .

To Find :

The amount of sample remains after 32 days .

Solution :

Rate constant is given by :

Now , by rate law :

Putting all given values, we get :

Therefore , the remaining sample after 32 days is 6.25 mg .

Hence , this is the required solution .

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