25 g
After 24.1 days, half of the 100-g sample will remain unchanged, leaving 50 g.
After another 24.1 days (total of 48.2 days), half of the remaining sample will remain unchanged, leaving 25 g.
Thorium-234 has a half-life of 24.1 days.
How much of a 100-g sample of thorium-234 will be unchanged after 48.2 days?
75 g
50 g
25 g
12.5 g
1 answer