Posted by **amor** on Wednesday, September 25, 2013 at 10:34pm.

If the half-life of a 20.0g is known to be 24 minutes, how long will it take for only 5.0 grams of the sample to remain

A.6 minutes

B.24 minutes

C.48 minutes

D.96 minutes

I NEED HELP!!!!

- science -
**amor**, Wednesday, September 25, 2013 at 10:36pm
IS IT.....C?

- science -
**Steve**, Thursday, September 26, 2013 at 5:34am
5g is 1/4 of 20g, so that's 2 half-lives

2x24 = 48 minutes, so you are correct.

- science -
**Mackenzie**, Wednesday, January 14, 2015 at 9:35pm
Hey! That's just what I'm trying to figure out! Maybe you ca help me!

- science -
**maddie**, Monday, March 23, 2015 at 12:09pm
i think its c but i'm not sure science is not my strong suit. this one is difficult.

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