Question

If you have 10 g of a substance that the keys with the half-life of 14 days then how much will you have after 42 days?

1.25
3.13
2.50
6.25

Answer 1

Its 1.25g, you can see how many 14 day trials are in 42 days with division. Then you will find its 3. So you use the half life equation (t1/2)