2. The isotope cesium-137 has a half-life of 29.75 years. How long will it take a 100 gram sample of cesium-137 to decay to 75 grams?

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A: Given Half life (t1/2) = 78.2 hours Initial amount (N0) = 45.7mg  Time (t) = 193 hours Radioactive…

Q: An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of…

A: Chemical kinetics is branch of chemistry in which we deal with speed at which rate of reaction…

Q: Seaborgium-266 has a half-life of 30 seconds. How many half-lives will pass in 30 minutes?

A: Given values -> Half life = 30seconds Total time = 30 minutes

Q: 4. Iron-59, which is used to diagnose anemia, has a half-life of 45 days. What fraction of it is…

A: we know that,→ Radioactivity phenomena follow first owen                            knnetics.so,…

Q: Chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells The half-life…

A:

Q: The half-life of a radioactive element is 1,250 years.What percent of the atoms remain after 5,000…

A: Number of half lives = 50001250 = 4 100%  →1250 years 50%  →1250 years 25% →1250 years 12.5 % →1250…

Q: Iodine-131 is administered orally in the form of Nal(aq) as a treatment for thyroid cancer. The…

A:

Q: Americium-241 is widely used in smoke detectors. The radiation released by this element ionizes…

A: The activity for the sample can be described as the amount of the radioactive particles are…

Q: A radioactive element has a half-life of 1.1 hours. How many hours will it take for the number of…

A:

Q: 11. The half-life of a newly discovered element, Jimmium, is 55 minutes. How long will it take a…

A:

Q: Chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells The half-life…

A: The initial amount of Chromium-51 (No) = 30.8 mg The half-life period of Chromium-51 (t1/2) = 27.7…

Q: Chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells The half-life…

A:

Q: Iodine-131 is used in the diagnosis and treatment of thyroid disease and has a half-life of 8.0…

A: The half-life of any radioactive element is the time in which it has been consumed half of its…

Q: " Ca is used in the study of bone formation. The half-life of Ca is 4.54 days. If you begin with…

A:

Q: Iodine-131 is administered orally in the form of NaI(aq) as a treatment for thyroid cancer. The…

A:

Q: The half-life of 123I is 13 hr.  How much of a  64 mg sample of 123I is left after 26 hours?

A: The isotope of iodine, 123I, undergoes decay in accordance with first order kinetics. The half-life…

Q: A sample of a newly discovered element, West Virginium, has a half-life of 288 years.  How long…

A:

Q: .Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is…

A:

Q: The half-life of plutonium-239 is 24,110 years. If an original sample is 100. grams, how much…

A:

Q: If the first-order half-life of tritium (³H) is 12.26 years, what amount of time is necessary for it…

A: Given data : half-life of tritium (³H) is 12.26 years Let the initial amount be x. Also given that,…

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

A:

Q: Iodine-131 is administered orally in the form of NaI(aq) as a treatment for thyroid cancer. The…

A: Since the decay reactions are first order reactions always hence for the first order reaction we can…

Q: Copper(II) acetate containing Cu is used to study brain tumors. This isotope has a half-life of 12.7…

A: Radioactive decay: Radioactive decay or nuclear disintegration is a process in which an atom with…

Q: Iodine-131 is administered orally in the form of NaI(aq) as a treatment for thyroid cancer. The…

A: Given half life = 8.04 days time = 12.7 days initial mass = 31.1 mg

Q: Iodine-131 is administered orally in the form of NaI(aq) as a treatment for thyroid cancer. The…

A:

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

A: Half-life of Cs-137 and initial mass, from which amount of Cs-137 left after 90.6 years.

Q: The half-life of phosphorus-33 is 25 days. How much of a 128-g sample will remain after 150 days?

A: Let initial amount of P-33 present initially long year back = Ao = 128 g Final mount of P-33 present…

Q: You analyze a sample of a meteorite that landed on Earth and find that 15/16 of the uranium-238…

A: The question is based on the concept of chemical kinetics. we have been given a radioactive material…

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A: Gallium - 67 has a half-life of 78.2 hours. Initially 36.7 mg of Gallium - 67 were present.   Here,…

Q: The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The…

A:

Q: Isotope X has a half-life of 71.8 years. If a sample initially contains 676. mg of X, what mass of X…

A:

Q: A nuclear power plant emits into the atmosphere a very small amount of krypton-85, a radioactive…

A: Given: Half life (t1/2) = 10.76 years  Total time (T) = 25 years

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: Iodine-131 is administered orally in the form of NaI(aq) as a treatment for thyroid cancer. The…

A: Radioactive decay is always a first order reaction. According to the first order radioactive decay…

Q: The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175…

A:

Q: Barium -122 has a half-life of 2 minutes.  Suppose you obtain a sample weighing 10.0g and it takes…

A:

Q: After 42 years, what mass remains of a 100.0 g sample of a radioactive isotope with a half-life of…

A:

Q: 9) U-235, one of the nuclides in spent nuclear reactor fuel, has a half-life of 703 million years.…

A: Recall the following expression to calculate required time for U-235 to be reduced to 3% of this…

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A:

Q: Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is…

A:

Q: If the first-order half-life of tritium (°H) is 12.26 years, what amount of time is necessary for it…

A: The half-life is the time taken for the reaction to complete half of its original concentration

Q: How much time is required for 84% of the isotope to decay?

A: Given: Iodine-131, which is used to treat thyroid cancer, has a half-life of 8.04 days. The…

Q: 186 Re is used in the treatment of bone cancer. The half-life of 18° Re is 3.72 days. If you begin…

A:

Q: Iodine-131 is administered orally in the form of NaI(aq) as a treatment for thyroid cancer. The…

A: Radioactive decay follow first order kinetics.

Q: lodine-131 is administered orally in the form of Nal(aq) as a treatment for thyroid cancer. The…

A:

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A: Here given, The half-life of gallium-67 (t1/2) = 78.2 hours Time (t) = 198 hours Initial amount (N0)…

Q: Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. (a) How many beta particles are…

A: Given: Half life of beta decay= 5.26 year Time= 600s Mass of Cobalt-60= 3.75 mg