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September 22, 2014

Homework Help: Chemistry-help please!

Posted by Charleze on Sunday, May 23, 2010 at 3:05pm.

The half-life of Xe-133 is 126 hours. Starting with 250. mg, after 500 hours around how many mg remain?
A. 63
B. 16
C. 32
D. 125

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