Question

1. Iron-59 has a half-life of 6 days. How much of a 1000g sample will be left after 42 days?

Answer 1

7.8125 g

Step-by-step explanation:

42/6 = 7 half-lives

Original: 1000 g

1st half-life: 500 g

2nd half-life: 250 g

3rd half-life: 125 g

4th half-life: 62.5 g

5th half-life: 31.25 g

6th half-life: 15.625 g

7th half-life: 7.8125 g