Question

The half-life of iodine-131 is approximately 8 days. Find the amount of iodine-131 left from a 35 gram sample after 32 days.

Answer 1

2.1875 grams

Explanation:

32/8=4 times it will divide 1/2

35/2=17.5

17.5/2=8.75

8.75/2=4.375

4.375/2=2.1875