half-lives...grrr

Question Posted Monday January 16 2006, 7:21 pm

Hey guys!
I'm working on my homework right now...and I'm having a horrible time figuring out half lives!

I was wondering if anyone could help me figure out this problem...

The half-life of polonium-218 is 3.0 minutes. If you start with 20.0 g, how long will it be before ony 1.0 g remains?

I'm really stuck right now and if you could please help me...I'll really appriciate (sp?) it!

Thanks so much
-mn731

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waterrabbit1104 answered Tuesday January 17 2006, 12:08 am:
I tried to find the actual formula for this problem, but i can't really locate it.

so here's a site that basically does the problem for you. Just pick which variable you want to solve for (in your case time), and input the values it requests.

[Link](Mouse over link to see full location)

I put in your problem and got 12.966 mins (pretty much 13 mins).

I hope i helped =/

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