Problem #4: After 24.0 days, 2.00 milligrams of an original 128.0 milligram sample remain. In addition, note that the question asked for the amount that decayed, not the amount that remaning. Note that the length of the half-life played no role in this calculation. How many grams of a 10.0 gram sample would have decayed after exactly three half-lives? Problem #3: Os-182 has a half-life of 21.5 hours. (1/2) 5.56 = 0.0213 (the decimal fraction remaining after 5.56 half-lives) If one had 6.02 x 10 23 atoms at the start, how many atoms would be present after 20.0 days? Problem #2: Pd-100 has a half-life of 3.6 days. (1/2) 3 = 0.125 (the amount remaining after 3 half-lives) If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed? Problem #1: The half-life of Zn-71 is 2.4 minutes. ChemTeam: Half-Life Problems #1 - 10 Half-Life Problems #1 - 10 Ten Examples Problems involving carbon-14 Probs 11-25 Problems involving uranium-238 Probs 26-40 Examples and Problems only (no solutions) Return to Radioactivity menu
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