The radioactive isotope Pu-238, used in pacemakers, has a half-life of 87.7 years. If 1.6 milligrams of Pu-238 is initially present in the pacemaker, how much of this isotope (in milligrams) will remain after 283 years? Express your answer in 2 decimal places.

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: The radioactive decay of a sample containing an unknown radioactive isotope produced 6274…

A: Given Initial disintegration = 6274 Final disintegration = 1898 Time = 15.31 days

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: 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: Phosphorus-32, a radioisotope used in the treatment of leukemia, has a half-life of 14.3 days. If a…

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

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Q: a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an initial sample of 33 grams,…

A: Reaction in which rate is linearly depend upon one reactant is known as first order reaction.

Q: Phosphorus-32 (P-32, Z=15), a radioisotope used in the treatment of leukemia, has a half-life of…

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Q: The half-life of Uranium-238 is approximately 4.5(10°) years. How much of a 10 kilogram block of U-…

A: Given data :- Half life = 4.5 x 109 years mass of uranium = 10 kg

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

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Q: You analyze the ratio of radioisotope carbon 14, or ¹⁴C, in these fossil bones. ¹⁴C has a half-life…

A: First calculate the radioactive constant and use that radioactive constant to calculate the age of…

Q: ou start with 2.00 moles of radioactive element with a half-life of 146 days. How many days until…

A: All decay reactions follow first-order kinetics.The initial number of moles of the element = 2.00…

Q: The half-life for gallium-67, a radioisotope, is 78.25 hours. How much of a 56.7 sample of…

A: Given datas ;  t1/2 = 78.25 hrs. [A]0 = 56.7 mg  [A]t = ?  t = 359 hrs.  t/t1/2   = 359 hrs / 78.25…

Q: lodine-131 is used in the treatment of tumors in the thyroid gland. Its half-life is 8.1 days.…

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

A: We have to predict the amount of iodine left

Q: Radioisotope X has a half-life of 4.0 h. Based on the figure below, if the original sample of the…

A: Half life (t1/2) :-  The time required for the concentration of reactant to reduce to half of its…

Q: Technetium-99 (half-life = 6.0 h) is used in medical imaging. How many half-lives would go by in 18…

A: technetium - 99 have half life = 6 hours

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: 81. Suppose a rock sample initially contains 250 grams of the radioactive substance unobtainium, and…

A: All radioactive decays follow first-order kinetics where the rate of reaction is directly…

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: A hepatobiliary scan is a common technique used to assess the functionality of a patient's…

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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: Iron-59 is a radioisotope used to study iron metabolism in the spleen. It has a half-life of 44.5…

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Q: Tritium, which is , has a half-life of 12.3 years. Calculate the amount of time it would take for…

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Q: Technetium -99 (Tc-99) is the most commonly used radiotracer in medicine. It is used to detect…

A: Decays reactions are first order reactions. Since we know that the relationship between the…

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

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Q: A substance has gone through 3 half lives. What percentage of the sample would remain?

A: Remaining % of sample can be calculated by      =     Original sample/ 2n assume original sample =…

Q: In medical application prior to having an MRI, a patient will be administered a dye containing a…

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Q: Fluorine-18 has a half-life of 1.8 hours. After one day, what percent amount of fluorine-18 remains…

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Q: Tritium H-3 has a half-life of 12.3 years. If a sample of 3 g of H-3 is produced, what will be the…

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Q: A chemical substance has a half-life of 5 hours.If you start with a 133 gram sample when will there…

A: Introduction: We have to calculate the time when substance remaining is 2g.

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: isotope of technetium (technetium-99m), has a half-life of 6 hours. A hospital has a sample which…

A: Half life = 6 hoursInitial amount of technetium-99m = 36 mgTime = 12 hours.

Q: Tritium (3H) has a half-life of 12.3 years. If there are 200g  of tritium at the beginning,…

A: Initial mass = 200 g  Half life = 12.3 years  We need to determine the mass after 2 years and 34…

Q: what fraction of k-38 remains after 2.00 hours? the half-life of k-38 is 7.71 minutes

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

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.