October 10, 2015

Homework Help: chemistry

Posted by Trixie on Friday, April 16, 2010 at 5:04pm.

A radioactive sample contains 3.25 1018 atoms of a nuclide that decays at a rate of 3.4 1013 disintegrations per 26 min.
(a) What percentage of the nuclide will have decayed after 159 d?

(b) How many atoms of the nuclide will remain in the sample?

(c) What is the half-life of the nuclide?

I have a general idea of how to solve this but keep getting the incorrect answer...I've tried a few different ways so I'm not sure where I'm going wrong. My initial attempt was to convert days into minutes for my calculations. I used the equation N'=Ne^-kt where I calculated k to be the rate given (over minutes). I don't need the answers per se...I think once I know how to correctly approach this I should be fine in figuring them out...Thanks

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