A rock contains 0.257 mg of Pb-206 for every milligram of U-238.The half-life for the decay of U-238 to Pb-206 is 4.5 x 109. How old is the rock?

Q: How long does it take for a radioactive substance to decay from 360 cps to 11.25 cps if the…

A: Half-life is the time required for the reaction to be half completed. It is denoted by t1/2 . For a…

Q: Uranium-235 has a half-life of 7.04 x 108 years. How many years will it take for 99.9% of a U-235…

A: Given,

Q: Cesium-137 is part of the nuclear waste produced by uranium-235 fission. The half-life of cesium-137…

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Q: Carbon-14 has a half life of 5730 years. How much carbon-14 would remain after 34380 years if the…

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Q: If the mass of a sample of radioactive cesium-137 decays from 71.9 milligrams to 20.8 milligrams in…

A: The integrated rate law expression for the first-order kinetics is: Half-life relates to the rate…

Q: 137 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: on 5 A The nuclide As-76 has a half-life of 26.0 hours. If a sample of As-76 weighs 344 g, what mass…

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Q: While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73…

A: Solution Tc ninety nine m is wide used for diagnostic and therapeutic functions. It emits gamma…

Q: The rate constant for a certain radioactive nuclide is 9.4 x 103h-1. What is the half-life of this…

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Q: If uranium-238 has a half-life of 45 billion years, how many years would it take for a 10-gram…

A: Given  Half life of U-238 (t1/2)   = 45 billion years 1 billion years    = 109 years  45 billion…

Q: Uranium-235 decays to Lead-207 with a half life of about 704 million. years. if you find a 1000g…

A: Half life of Uranium-235t12 = 704 million years Initial amount of fossilNo= 1000 gms Final amount of…

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: 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: Half-life of Cs is 30.2 years. Intial amount sample = 100 g  Final amount sample = 1.00 g

Q: Cs-134 has a half-life of 2.0 years. How much of a 2.50-g sample of this isotope will remain after…

A: Given :- half life of Cs-134 = 2.0 years                Initial amount of sample = 2.50-g  To…

Q: a rock conatains 0.257mg of Pb-206 for every milligram of U-238. The half-life for the decay of…

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Q: The Cs-131 nuclide has a half-life of 30 years. After 120 years, 4.5 g remain. What is the original…

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Q: The Cs-131 nuclide has a half-life of 30 years. After 120 years, 4.4 g remain. What is the original…

A: The Answer to the following question is-

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: A rock contains 0.232 g of Pb-206 to every 1.00 g of U-238. Determine the age of this rock assuming…

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Q: Cobalt-60 decays with a half-life of 5.27 years. What is the rate (in 1/yr) of decay?

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Q: How long would it take for the amount of u-235 to reach 1/8 of its initial amount? One of the…

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Q: How long will it take for a 40.0-gram sample of Iodine-131 to decay to 1/16th of its original mass?…

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Q: A 40.0 mg sample of a radioactive substance decays to 10.0 mg in 10 days. What is the half-life of…

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Q: 2. A radioactive sample contains 9.5 x 1017 atoms of a nuclide that decays at a rate of 5.4 x 1013…

A: Radioactive disintegration follows first order kinetics.

Q: Potassium-40 decays to argon-40 with a half-life of 1.27 * 109 yr. What is the age of a rock in…

A: It is given that potassium-40 decays to Argon-40 and has a half-life of 1.27×109 years and the mass…

Q: The radioactive nuclide Co has a half-life of 8.5 hours. What mass of Co remains from a 0.0196 g…

A: Half life = 8.5hrs  Mass = 0.0196g  t = 18hrs

Q: 2. The isotope cesium-137 has a half-life of 29.75 years. How long will it take a 100 gram sample of…

A: First-order reaction: The type of reaction which depends only on one substance is called a…

Q: The half-life of thorium-227 is 18.72 days. How many days are required for three-fourths of a given…

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Q: It takes 870.98 years for carbon-14 to decay to 90 mg. What is the half life of carbon-14?

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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…

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Q: isotope with a half-life of about 22 minutes. How much time will it take for a sample of Fr-223 to…

A: Radioactivity follows first order kinetics,  Half life time (t1/2) = 22 minutes  k = 0.693/t1/2 =…

Q: The Cs-131 nuclide has a half-life of 30 years. After 120 years, 5.2 g remain. What is the original…

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Q: The half life of iodine-125 is 60 days. What fraction of iodine-125 nuclides would be left after 360…

A: As per guidelines if multiple questions posted , first question is allowed to answer , please post…

Q: The half-life of Ga-67 is 77.9 hours. How long will it take Ga-67 to decay and lose 95% of its…

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Q: 137 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: The Cs-131 nuclide has a half-life of 30 years. After 120 years, 3.3 g remain. What is the original…

A: Answer

Q: What is the half-live of a radioactive isotope if it takes 6.2 days for a 72g sample to decay to…

A: Given, 72 g to decay to 18 g. t = 6.2 days To calculate the half-life.

Q: The Cs-131 nuclide has a half-life of 30 years. After 120 years, 3.8 g remain. What is the original…

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Q: A rock contains a Pb-206 to U- 238 mass ratio of 0.262: 1.00. Assuming that the rock did not contain…

A: The answer to the following question is-

Q: The Cs-131 nuclide has a half-life of 30 years. After 120 years, 4.2 g remain. What is the original…

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Q: After 103 days, only 2.3 g of a radioisotope remains from a sample that originally has 150 g of it.…

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Q: The Cs-131 nuclide has a half-life of 30 years. After 120 years, 3.0 g remain. What is the original…

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Q: Given the half-life of Carbon-14 is 5770 years, how much of a 540 gram sample is left after 10000…

A: For the given radioactive decay process: Rate constant, k =?  Half-life=5770 years According to…

Q: Cs – 137 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: The Cs-131 nuclide has a half-life of 30 years. After 120 years, 6.6 g remain. What is the original…

A: Radio active decay obeys first order kinetics. The expression for rate constant:   Half life of…

Q: With a half-life of 6.56 minutes, aluminum-29 decays to silicon-29 nuclide. After 18 minutes, what…

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Q: The half-life of radon-222 is 3.8 days. How much of a 100 gram sample is left after 15.2 days?

A: Half life is the time taken by the original compound to reduce to it's half.

Q: The isotope Np-238 has a half life of 2.0 days. If 96 grams of it were present on Monday, how much…

A: Here given, The half-life of Np-238 (t1/2)= 2 days. Initial amount present (N0) = 96 g Time (t) = 6…

Q: The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10 hours.…

A: