Question

A radioactive isotope has a half-life of 2 minutes. How many total minutes will it take for 100-g of the isotope to get to just 6.25-g remaining

Answer 1

8 minutes

Step-by-step explanation:

G(g) T(min)

100 --------------- 0

50-------------------2

25 -------------------4

12.5 --------------- 6

6.25 ----------------8

another way:

100/6.25 = 16

16 = 2⁴ ( 4 half lives)

Each half life is 2 minutes

so 4 half lives will be 8 minutes

Answer 2

It would take 12 minutes.