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The decay of radioactive cadmium follows first-order kinetics. A sample of radioactive cadmium has a half...
The decay of radioactive cadmium follows first-order kinetics. A sample of radioactive cadmium has a half life of 15 days. If you have a sample that originally weighed 40 g and later weighs 2.5 g, how much time elapsed between the initial and final masses? Given the following reaction: 2A (g) ↔ B (g) + C (g) ∆H˚ = +27 kJ K = 3.2 x 10-4 Which of the following would be true if the temperature were increased from 25˚C...
Radioactive substances decay by first-order kinetics. How many days would be required for a sample containing phosphorus-32 to decrease to 38.45% of its initial activity? The half-life of phosphorus-32 is 1.42e1 days.
All radioactive decay processes follow first-order kinetics. The half-life of a gamma producing radioactive isotope is 2.4 hours. This isotope is used in a medical scan and enough of the isotope is given such that a heart scan can be done? If 0.75 ng of the isotope is administered, how ng of the isotope remains in the patient after 3.5 days?
Question 1: Answer the following questions regarding half-lives. Assume first-order half life kinetics (2 pts total). A. The half-life of Co-60 is about 5.25 years. Starting with a 42 g sample, how much remains after 21.0 years have passed (1 pt)? B. The Spider that bit Miles Morales secretes an unknown radioactive chemical that decays via first order kinetics. Originally 27.0 mg, only 5.3 mg remains after 32 days. What is this compound's half-life (1 pt)?
The Cadmium isotope 109Cd is radioactive. A sample begins decay with 1012 Cd atoms. After 500 days, 4.7 x 1011 atoms remain. What is the half-life of this sample? (a) 46 days (b) 102 days (c) 459 days -- right answer but not sure how to get it (d) 662 days (e) none of the above
lodine 131 has a half life of 8 days and decays by a first order process (as is always the case for radioactive decay). How much of a 46 gram sample of iodine 131 will remain after 8 days? Report your answer in grams.
the radioactive decay of CO-60 is a first order process the initial weight of the atom is 50 gram, after 260 days the remaining weight is 6.25 gram, what is the half-life if radiation atom
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 =...
Problem. The daughter nucleus formed in radioactive decay is often radioactive. In this case we have a decay chain as shown below A → B → C That is, atoms of A decay into an atoms of B and atoms of B decay into atoms of C. Let A0 represent the number of parent nuclei at time t = 0, A the number of parent nuclei at time t, and λ1 be the decay constant of the parent. Suppose the...
PS2.7 The half-life for the (first-order) radioactive decay of 14C is 5730 years. An archaeological sample contained wood that had only 69 percent of the 14C found in living trees. What is its age?