Sodium-24 has a half-life of 15 hours. How much of a 20 mg sample would remain after two half-lives?
- lenpol7Lv 75 months agoFavorite Answer
1st 1/2 life 10 g
2nd half life 5g
3rd 1/2 life 2.5 g
4th 1/2 life 1.25g
Theoretically there is always a trace amount; it never reaches 0 g, . .
- pisgahchemistLv 75 months ago
This question is in the ridiculously easy category. If you start with 20 mg, after one half-life you have 10 mg. That's the definition of "half-life." After a second half-life there will be 5 mg.