Kinetics of Radioactive Decay 1. Plutonium-239 (produced in breeder reactors has a half-life of 24,100 years. How long will it take for a sample of plutonium-239 to decay to 0.100% of its original value?

Q: Uranium-238, 238U, has a half-life of 4.51 x 109 years. How long will it take for 1.0 g of 238U to…

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Q: If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9% of the…

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Q: Radioactive calcium-47 decays with a half-life of table (calcium-47) days. A chemist obtains a fresh…

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Q: U-238 decays with the half-life of 4.47 billion years. Calculate the % of a sample left after 13.4B…

A: Given : Half life = 4.47 billion years  Time = 13.4 billion years.

Q: The half-life of strontium-90 is 28 years. H

A: Given t1/2 of a reaction is 28 years  decay constant  (λ) λ = 0.693t1/2     = 0.69328 y     =…

Q: pure polonium-210 (k = 5.02 × 10−3 day−1) were used in a crime, based on radioactive disintegration…

A: Radioactive disintegration follow first order kinetics

Q: Plutonium-239 (produced in breeder reactors has a half-life of 24,100 years. How long will it take…

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Q: 120 mg sample of technium 99m is used for a diagnostic test. if a technium 99m has a half-life of…

A: Given- Initial mass = 120 mg Half life = 6.0 hrs To find- milligrams of the technetium 99M sample…

Q: The half-life of strontium-87 is 2.8 h. What percentage of this isotope will remain after 8 h and 24…

A: Radioactive decay is the breaking of unstable nuclei into stable ones by emitting radiation. These…

Q: 5. Carbon-11, used in medical imaging, has a half-life of 20.4 min. The carbon-11 nuclides are…

A: Answer: Relation between quantity of radioactive substance and n number of half lives is shown…

Q: NUCLEAR REACTIONS Zinc-62 decays with a half-life of 9.186 hours. 1. Write the balanced nuclear…

A: Answer: All nuclear reactions are first order reaction therefore integrated rate law of first order…

Q: 187 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Given datas –  t1/2 = 30.2 years  t = ?  [A0] = 100.0 g  [At] = 1.20 g

Q: 8. What mass of plutonium-240 will remain after 32,820 years if the initial sample contained 4.8 g…

A: No. of half lives = Total time/ half- lives n = 32820/6564 = 5 n = 5

Q: Radioactive iodine (Iodine-131) has a half-life of 8.04 days. How long will it take for 150g of…

A: Given: The half-life of Iodine-131, t12 = 8.04 days. The initial amount of Iodine-131, (N0) = 150 g.…

Q: 6. A rock contains 0.257 mg of lead-206 for every milligram of uranium-238. The half-life for the…

A: Given, Half-life - 4.5 × 109 yr. 1 mg U-238 contains 0.257 mg of Pb-206.

Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

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Q: After 42 years, what mass remains of a 200.0 g sample of a radioactive isotope with a half-life of…

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Q: Hydrogen-3 has a half-life of 12.3 years. How many years will it take for 890.0 mg 'H to decay to…

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Q: ives? A sample of Oxygen-19 has decayed down to 1/32 of its initial concentration a What is the…

A: We have to find half life

Q: A dinosaur fossil sample has 30% of its original amount of carbon-14 present. Assuming that the…

A: The objective of the question is to calculate the age of the fossil.

Q: Americium-241 is a radioactive isotope that is used in smoke detectors. It has a half-life of 432.2…

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Q: Technetium-99m (the ‘m’ means a ‘metastable’ or moderately stable species) is generated in nuclear…

A: Use half life and date constant formula  Final mass= 125.95mg

Q: What mass of plutonium-240 will remain after 32,820 years if the initial sample contained 4.8 g of…

A: We know nuclear decay follows First order kinetics. we have to use the formula - t12=ln2K from this,…

Q: Carbon 14 decays to carbon12. The half-life of the C14 isotope is 5730 years. 3000 years after an…

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Q: How long does it take for 78% of a sample of cobalt-60 to decay (the half-life is 5.26 years)?

A: To solve this problem we have to first calculate the rate constant of the reaction by using half…

Q: The half-life of Radium-226 is 8 years. How much of an initial 171 g sample will remain after 43…

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Q: The half-life of plutonium-239 is 24,100 years. How long will it take for a 100 g sample of…

A: Given,  Half life, t1/2 = 24100 years Initial amount = 100 g Reduced amount = 25 g Formula Used…

Q: Cobalt-60 is used extensively in medicine as a source of g-rays. Its half-life is 5.27 years. How…

A: Given Half life ( t1/2 )   = 5.27 year  Initial Activity ( A0 )  = 100 %  Remaining amount ( At ) =…

Q: One of the radioactive isotopes used in chemical and medical research is iodine-125, which has a…

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Q: what is the half-life of plutonium-239 if it takes 14 098 years for 33% of a given sample to decay

A: Radioactive decay follows the first-order kinetics. According to the first-order kinetics, the decay…

Q: -137, a beta emitter has a half-life of 30 vears

A: Dear student I have given answer to your question in the image format.

Q: How long long does it take for 78 % of sample of cobalt-60 to decay (the half life is 5,26 years)?

A: The rate of a reaction is expressed as: Rate = k[A]n where k is the rate constant, [A] is the…

Q: A 50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured…

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Q: The radioactive substance neptunium -139 decays to 72.85% of its original amount after 28 hours. How…

A: For radioactive decay, relation between rate constant and its concentration is give below.…

Q: 13' Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

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Q: lodine-131 is a radionuclide that is frequently used in nuclear medicine. Among other things, it is…

A: Sample mass of Iodine - 131 initially = 0.16 gram Half life of iodine-131 = 8 days We know that…

Q: If a rock sample was found to contain 1.27 x 10-7 mol of argon-40, how much potassium-40 would also…

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Q: plutonium 239 produced in breeder reactors has a half-life of 24100 years how long will it take for…

A: Answer: Time for 10% decay of Pu-239 is 3665.175 years

Q: The half-life of Radium-226 is 13 years. How much of an initial 179 g sample will remain after 36…

A: Radio active reactions are first order reactions. Decay constant (k) = 0.693 / t1/2 Where, t1/2 =…

Q: 1. What are the numbers of protons, electrons and neutrons in 232Th? 2. The half-life of Cobalt- 60…

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Q: "Pu nat fraction of pre

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Q: In a nuclear reactor, the excess neutrons produced from fission are absorbed by elements, preferably…

A: Those materials can be used to absorb neutrons in a nuclear reactor which will form most stable…