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July 22, 2014

July 22, 2014

Posted by **jay 1** on Tuesday, October 12, 2010 at 8:29pm.

- chemistry -
**DrBob222**, Tuesday, October 12, 2010 at 8:48pm8mg to 0.25 mg means how many half lives.

1 half life = 4 mg remain

2 half lives = 2 mg remain

3 half lives = 1 mg remain

4 half lives = 0.5 mg remain

5 half lives = 0.25 mg remain.

It takes 124 hours for a half life; therefore, it must take 124 x 5 for the 5 half lives.

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