Thursday
November 27, 2014

Homework Help: Chemistry

Posted by Jay on Friday, May 6, 2011 at 11:20am.

How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s

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