Question

Thorium 234 has a half life of 24 days and a beginning sample of 64-g. I need to know the total number of days after each half life and mass remaining after each half life.

Answer 1

the number of days after each half-life will be equal to the total number of days? After one half-life, 24 days has passed, and half of the 64g sample remains. After another half-life, ANOTHER 24 days has passed, (so how many total?) and half of THAT remaining sample still remains.

Just keep dividing the mass in half for each half-life, and adding 24 days to every time

Answer 2

1 half life = 24 days = 32 g left
2 half lives = 48 days = 16 g left
3 half lives = 72 days = 8 g left
4 half lives = 96 days = 4 g left
5 half lives = 120 days = 2 g left
6 half lives = 144 days = 1 g left
7 half lives = 168 days = 1/2 g left
and so on