# science

posted by .

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 -

IS IT.....C?

• science -

5g is 1/4 of 20g, so that's 2 half-lives

2x24 = 48 minutes, so you are correct.

• science -

Hey! That's just what I'm trying to figure out! Maybe you ca help me!

• science -

i think its c but i'm not sure science is not my strong suit. this one is difficult.

• science -

Its c

• science -

i realy dont know

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