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A sample of pure sodium-24 has an initial mass of 10.0 grams. How many grams of sodium-24 will remain at the end of 4 half-lives? A. 0.315 B. 0.630 C. 5.00 D. 6.00
If a sample of pure sodium-24 has an initial mass of 10.0 grams, there will be 0.630 grams remaining at the end of 4 half-lives. 1st half-life - half decays: 10 / 2 = 5 2nd half-life - half decays: 5 / 2 = 2.5 3rd half-life - half decays: 2.5 / 2 = 1.25 4th half-life - half decays: 1.25 / 2 = 0.63
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Asked 4/22/2013 7:50:40 PM
Updated 7/25/2014 5:39:38 PM
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If a sample of pure sodium-24 has an initial mass of 10.0 grams, there will be 0.630 grams remaining at the end of 4 half-lives.
1st half-life - half decays: 10 / 2 = 5
2nd half-life - half decays: 5 / 2 = 2.5
3rd half-life - half decays: 2.5 / 2 = 1.25
4th half-life - half decays: 1.25 / 2 = 0.63
Added 7/25/2014 5:39:38 PM
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