Calculating Half Life: How Many Years for 1/64 of Hydrogen-3 to Remain

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The half-life of Hydrogen-3 (Tritium) is 12.5 years. To determine how many years it takes for 1/64 of its original mass to remain, six half-lives must occur, as each half-life reduces the mass by half. Therefore, the total time elapsed is 6 times 12.5 years, equating to 75 years. The term "12.5a" refers to 12.5 years, indicating the duration of one half-life. Thus, it takes 75 years for 1/64 of Hydrogen-3 to remain.
Natalie
[SOLVED] Half Life

I can't get the answer to this question.
If Hydrogen 3 ( 3H )
( 1 )
has a half life of 12.5a, how many years have passed when only 1/64 of its original mass remains?
 
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12.5a?

Half life is a pretty simple thing, you can count this one on your fingers. 1 half life is 1/2, 2 half lives is 1/4, 3 is 1/8, 4 is 1/16, 5 is 1/32, and 6 is 1/64.

But I don't know what "12.5a" means.
 

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