Question

The half-life of ZN-71 is 2.4 minutes. Given you start with 50g of the material, how many minutes will pass before you have 5g left?

Answer 1

time. mass

0. 50

2.4. 25

4.8. 12.5

7.2. 6.25

9.6. 3.125

thus, 7.2 minutes would pass before you get 5 g left