Homework Help: chemistry

Posted by adrienne on Thursday, September 16, 2010 at 10:57am.

Tritium (half-life = 12.3 y) is used to verify the age of expensive brandies. If an old brandy contains only the following fraction of the tritium present in new brandy, how long ago was it produced?
1/128

chemistry - Dr Russ, Thursday, September 16, 2010 at 11:03am
After one half life the ratio is 1/2
After two half lives the ratio is 1/4
After three the ratio is 1/8

so how many half lives to get to 1/128?
chemistry - Anonymous, Thursday, September 16, 2010 at 4:20pm
24.6

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