Question

Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in a 36.0-g sample after 45 hours

Answer 1

4.5 gm left

Step-by-step explanation:

45 /15 = 3 half lives (1/2 )^3 =1/8 th

1/8 * 36 = 4.5 gm