Fluorine-21 has a half -life of approximately 5 seconds. how much of a 200 gram sample would remain after 1 minute

0.0488 g

We are given

The radioisotope Fluorine-21

Half-life is 5 seconds

Initial mass of Fluorine-21 is 200 g

Time = 1 min or 60 seconds

Required to determine the New mass after decay

New mass = Original mass × (1/2)^n , where n is the number of half lives.

In this case, n = 60 s ÷ 5 s

                       = 12

New mass = 200 g × (1/2)^12

                 = 200 g × 1/4096

                = 0.0488 g

Therefore, the mass of Fluorine-21 remaining after 1 minute is 0.0488 g

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