A radioactive sample contains 1.55 g of an isotope with a halflife of 3.8 days. What mass of the isotope remains after 5.5 days?

Q: 2. A sample of iodine-126 with an original mass of 15.00 mg loses 13.125 mg of the original mass of…

A: When the quantity is reduced to one-half of the original of a radioactive sample, then the time…

Q: Thorium-234 has a half-life of 24.1 days. Suppose the initial amount of Thorium-234 is 162.9 mg,…

A: All natural and artificial radioactive decays follows first order kinetics The integrated rate…

Q: How many half‑lives of the unknown radioactive substance have occurred?

A: As we know that decay of radioactive substance follows first order kinetics

Q: (11) Lead-211 is a radioactive isotope with a half-life of 36.1 minutes. How long will it take for…

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Q: The half-life of 234U, uranium-234, is 2.52 105 yr. If 98.9% of the uranium in the original sample…

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Q: A 739.7 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

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Q: If the amount of a radioactive element decreases from 2.4 g to 0.30 g in 12 days, what is its…

A: Given: Initial amount of radioactive element, N∘=2.4gFinal amount of radioactive element, N =…

Q: A substance has a half-life of 2.045 minutes. If the  initial amount of the substance was 132.8…

A: Given,  Half-life, t1/2  = 2.045 minutes Initial ammount, A0 = 132.8 gram

Q: After 20 years, only 3.125% of the initial amount of radioactive isotope is left. What is the…

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Q: If you start with 71.0 grams of a radioactive substance with a half life of 3 days, how much will be…

A: Here given, Initial amount (N0) = 71 grams Half life (t1/2) = 3 days Time (t) = 15 days Amount left…

Q: After 60 days, 10 grams of radioactive isotope remains from an original 27 g sample. What is the…

A: Given,

Q: The isotope Bismuth-212 has a half life of 368.65 day. What mass in mg of a 2 mg sample will remain…

A: Half life of Bismuth, t1/2 = 368.65 days. Bismuth-212 is a radioactive element. Thus, it will follow…

Q: A scientist obtains 64 grams of a radioactive isotope.  The isotope has a half-life of 3.2 days.…

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Q: 1.) Carbon-14 has a half-life of 5600 years. If you had a sample of 100% carbon-14, how much would…

A: Given, carbon-14 half life with 100 % carbon-14 sample.we are asked to calculate the amount of…

Q: If you are given a sample of 14 g of a radioactive substance and waited for 4 half-lives to pass,…

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Q: The radioactive nuclide has a shelf-life of 17.5 hours. What mass remains from 0.0100g sample after…

A: Shelf-life of 17.5 hours, Calculate the mass remains from 0.0100 g after 24 hours.

Q: A patient receives 9.2 ng of a radioisotope with a half-life of 12 hours. How much will remain in…

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Q: 100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will…

A: Radioactive decay follows first order kinetics. Given that half life is 36 hours. So the rate…

Q: A radioactive isotope has a half-life of 12.0 seconds. How much of a 100 gram sample is left after…

A: Given  Initial Mass of Sample ( A)0  = 100 gram  Half life time ( t1/2)   = 12 sec  Time ( t ) = 36…

Q: A radioactive substance has a ​half-life of 437 years. What is its decay​ rate?

A: Radioactive Decay: Radioactive decay is the property of the several naturally occurring elements as…

Q: A radioactive sample contains 1.55 g of an isotope with ahalf-life of 3.8 days. What mass of the…

A: Radioactive isotopes may occur naturally or be artificially produced. Radioactive isotopes possess…

Q: A sample of iodine-126 with an original mass of 15.00 mg loses 13.125 mg of the original mass of the…

A:

Q: 27. A radioactive substance weighs 30.0 grams and has a half-life of 2,460 years. How much will…

A: As  we know that all radioactive reactions are first order reaction. Given in the question, Mass of…

Q: Can the half-life of a given isotope be manipulated or changed to suit human needs?

A: Answer

Q: 26. Four hundred grams of a radioactive substance decays to 50.0 grams. If it has a half-life of…

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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: At a certain instant, 100 grams of radioactive substance is present. After 20 years, 99.76 grams…

A: The half-life is the time required to change the initial amount to half of the amount. It is denoted…

Q: A 169 ng sample of radioactive material has a half life of 3.9 days. How many ng of radioactive…

A: Sample of redioactive material=169ng Half life=3.9days

Q: The nuclide As-76 has a half-life of 26.0 hours. If you start with a 344 g sample of As-76, what…

A: Step : 1               Calculate the mass of As-76 remains after 538 minutes.

Q: After 60 days, 10 grams of radioactive isotope remains from an original 80 g sample. What is the…

A: Law of radioactive decay: Law of radioactive decay relates the amount radioactive substance…

Q: 145 g sample of radioactive has a half live of 6.4 days how many g of material is left are 2 half…

A: The time required to disintegrate the molecule to half of its initial concentration is called the…

Q: A radioactive sample contains 2.90 gg of an isotope with a half-life of 3.8 days How much of the…

A: Given- Initial mass = 2.90 g Half life = 3.8 days To find- mass of the isotope in grams remaining…

Q: How much of a 0.230 g radioactive sample with a half-life of 8 hours would remain after a period of…

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Q: If 20% of the radioactive substance disappears in one year, find its half-life assuming exponential…

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Q: A radioactive sample contains 2.45g. How much willl remain after 11.4 days? (Half life is 3.8 days)

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Q: A 180.9 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

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Q: If you have 2.00 grams of a radioisotope, with a half-life of 5 days, how much of the isotope is…

A: Given;

Q: The half-life of a given radioactive substance is 2.5 minutes. What fraction of the original…

A: Given, half-life , t1/2 = 2.5 min                     and, t = 10 min We need to calculate the…

Q: 12. A year ago there were 4 grams of a radioactive substance. Now there are 3 grams. How much was…

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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: After 60 days, 10 grams of radioactive isotope remains from an original 38 g sample. What is the…

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Q: A radioactive isotope has a half-life of 60.2 days. What fraction of the isotope remains after 418…

A: Provided half life(t1/2) = 60.2 days Provided time(t)=418 days Let initial amount= [A•] Let final…

Q: A solution of sodium iodine containing the radioactive isotope lodine-131 was given to a patient. If…

A: These radioactive decay reactions are the first order reactions . In these type of reactions , rate…

Q: Define the term half-life and illustrate it with an example.

A: The rate of the reaction is referred to the change in the molar concentration in the distinct…

Q: If the half-life of a radioactive isotope is 3.5 minutes, how many grams of a 200-gram sample would…

A: The interval of time required for a radioactive isotope to decay to one-half of its atomic nuclei is…

Q: A certain radioisotope has a half-life of 9.54 days. What percentage of an initial sample of this…

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Q: When will a 1.00 g sample of thorium–232 have a mass of 1.00 mg, knowing that the half – life of…

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Q: A radioactive sample has a mass of 500 grams. How much remains after two half-lives?

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Q: 1. Gold-191 has a half life of 12.4 hours. What mass of this isotope would remain after 49.6 hours…

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