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msamadia
Joined: 02 Aug 2006
Posts: 13
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 Posted: Mon Aug 24, 2009 10:20 am Post subject: |
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How can it be 8 g. after the first half life left with 4 then another h-life, 2 and the 3rd h-life 1 g left.
I don't understand the problem. thanks! |
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mcat_premed3832
Joined: 19 Oct 2006
Posts: 413
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| Posted: Wed Aug 26, 2009 9:00 am Post subject: 1/2 life |
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Yes, you are correct.
Keep in mind that the original sample is pure Tl and weighs 8g (which we have determined in the Explanation). And since there is only 1 g of the original sample left (Tl), then according to the conservation of mass, the other 7 g must be present in the other product of the reaction, ie Pb. |
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gotemrecor5286
Joined: 31 Dec 2010
Posts: 8
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| Posted: Sat Jul 30, 2011 6:34 pm Post subject: |
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| Good question. Had me fooled, but now I understand. |
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