If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9% of the radioactive material has decayed so that you can safely wear the shoes again? (half life=14.26 days)

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: A 16.0 g sample of technicium-99m has a half-life of 6.0 hours. How much sample remains 24 hours…

A: As per the given information in the question, First calculate the rate constant (K) of the…

Q: The half-life of the radioactive isotope astatine-218 is 2.00 seconds. How long will it take for the…

A: all radioactive reactions are first order.  Here first calculate the rate constant with the help of…

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

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Q: Carbon-14 undergoes nuclear decay and has a half-life of 5,730 years. How many moles will be left…

A: Given :-  initial amount of sample = 50 moles  half life (t½) = 5730 years  To calculate :-  amount…

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: Use the References to access important values if needed for this question. Iron-59 is a radioisotope…

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

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Q: 30% of a radioactive substance has decayed after 10years, what is its half-life?

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Q: What is the half-life of an element that begins with 100g, and 18.8g remains after 113 minutes.

A: Half life of radioactive element-is the time needed for given number of its nuclei to decay exactly…

Q: (6) After three half-lives, 100% (A) (B) 50% (C) 25% (D) 12.5% % of the initial isotope of a…

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Q: The half-life of selenium-83 is 22.3 min. If a sample contains 24.0g of selenium-83, how long will…

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Q: The half life of a certain substance is 5.6 days. How long will it take for 100 g of the substance…

A: Radioactive decay follows the first-order kinetics. The decay constant (λ) and half-life of a…

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

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Q: 1. Iron-59, which is used to diagnose anemia, has a half-life of 45 days. What fraction of it is…

A: As in the question, it is given that Iron-59 is used to diagnose anaemia and has a half-life of 45…

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: The half-life of carbon-14 is about 5715 years. A sample contains 1 gram of carbon-14. How much will…

A: Formula for half life,  N (t )= No(1/2)t/t1/2 where, N (t) = quantity of the substance remaining…

Q: 17. If it takes 12 half-lives for a radioactive chemical (k = 4.85 x 10-2 day¹) to decay to a level…

A: Half-life is the time taken for half of the radioactive atoms of a specific radionuclide to decay

Q: Chemistry If you have an 88 gram sample of radioactive material decaying and the half life is 12…

A: Introduction: Radioactive decay: Radioactive decay or nuclear disintegration is a process in which…

Q: Radium-223 has a half-life of 11.43 days. How long will it take for 80% of a sample of the said…

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

A: The first-order rate law can be transformed into another highly useful equation with the decay…

Q: Strontium-90 is a nuclide that is found in radioactive fallout from nuclear weapon explosions. Its…

A: Given :  Half life = 28 years

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

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Q: The half-lives of different radioisotopes are given in the table. Radioisotope Half-life (min)…

A: Given: Initial amount of potassium-44 = 96.0 mg Final amount of potassium-44 = 12.0 mg Half-life for…

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: 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: 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: If plutonium-238 has a half-life of 88 years, how long will it take for a 100g sample of it to decay…

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

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Q: (Q114) A meteorite recovered from a meteor landing site in the Australian outback contains 0.438 g…

A: we have to calculate the age of meteorite

Q: An organism had 665 grams of Carbon-14 (a radioactive form of carbon) in it when it died. How much…

A: Carbon-14  is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8…

Q: An organism had 170 grams of Carbon - 14 (a radioactive form of carbon) in it when it died. How much…

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Q: Iron-59 is used to study iron metabolism in the spleen. Its half-life is 44 days. How many days…

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Q: A sample of radioactive radon-222 was found to have a half-life of 3.823 days. What fraction of the…

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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: The half-life of I-131 is 8.0 days. If a medical treatment involves a dose of 100. mg of I-131, how…

A: The remaining I-131 isotope after 16 days is calculated as shown below. where t1/2 is the half-life,…

Q: The radioactive isotope I-131is used in the treatment of hyperthyroidism. When administered to a…

A: Radioactivity is the process by which the nucleus of an unstable loses its energy by emitting the…

Q: avier is at NASA analyzing Moon rocks. In one of the rocks from the lunar maria, he discovered 79 %…

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Q: The radioactive decay of thallium−206 to lead−206 has a half-life of 4.20 min. Starting with 5.60…

A: All radioactive decay follows first order kinetics. So we can use the equation of first order…

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

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Q: Radium has a half-life of 1600 years. How many years does it take for 90% of a given amount of…

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Q: A chemical substance has a half-life of 5 hours.If you start with a 78 gram sample , when will there…

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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: 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

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.