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8. The nuclide 76 As has a half-life of 26.0 hrs. If a sample of "As...
The Cs-131 nuclide has a half-life of 30 years. After 120 years, 8.7 g remain. What is the original mass of the Cs-131 sample?
A certain radioactive nuclide has a half life of 50.7 years. How long does it take for 87.5% of a sample of this substance to decay? years Submit Hide Hints Hint 1 Hint 4 Hint 3 Hint 2 What percentage of the original sample has decayed after two half lives have elapsed?
A radioactive nuclide of mass number 94 has been prepared by neutron bombardment. If 4.7 µg of this nuclide registers 20. counts per minute on a radioactivity counter, what is the half-life of this nuclide? Answer in mins please
8. Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half-lives. How much time will elapse for this sample to be considered gone? 9. 100.0 grams of an isotope with a half-life of 36.0 hours is present initially. How ma time will have elapsed when 5.00 grams remains? 131 (half-life = 8.040 days) to decay to 10. How long will it take for a 40.0 gram sample of 1-131 (half-life =...
Determine the half-life of a nuclide that loses 38.0% of its mass in 407 hours. (a), 291 hours. (b), 568 hours. (c), 204 hours. (d), 586 hours.(e) 281 hours.
Sodium-24 is used to study blood circulation and has a half-life of 15 hours. Which one of the following statements is true? a. It is not possible to know exactly how much remains after 45 hours because the rate of decay depends on the initial amount. b. After 45 hours have elapsed, all of the nuclide will have decayed. c. After 45 hours have elapsed, 1/8 of the original amount remains d. After 45 hours have elapsed, 1/4 of the...
After 42.0 min, 26.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics? _(answer)____ min
A certain radioactive nuclide has a half life of 74.8 years. How long does it take for 87.5% of a sample of this substance to decay? ___years?
A certain radioactive nuclide has a half life of 44.3 years. How long does it take for 87.5% of a sample of this substance to decay? years
A) 13N decays with a half-life of approximately 10 min to produce 13C, a stable isotope of carbon. For a 1.0g sample of 13N, after one half-life, what mass of 13N remains? What has happened to the remaining mass? B) 223Ra decays by alpha emission with a half-life of 11.43 days. For a 1.0g sample of 223Ra, after one half-life, what mass of 223Ra remains? What has happened to the remaining mass?