Americium-241 is used in smoke detectors. If 15% of the americium-241 in a smoke detector decays in 101 years, what is the half-life of the isotope? O a. 4.3 x 102 yrs O b.1.6 x 10-3 yrs OC. 6.2 × 102 yrs O d. 3.4 x 102 yrs O e. 7.1 yrs

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: Bandages can be sterilized by exposure to gamma radiation from cobalt-60, which has ahalf-life of…

A: Given: The mass of the sample is 5.27 Y. The half-life of cobalt-60 is 5.27 y.

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A:

Q: 29) a rock from the moon was found to contain 1.0 x 10* g (A,) of uranium-238 and 4.0 x 10“ g…

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Q: The first-order decay of radon has a half-life of 3.823 days.  How many grams of radon remain after…

A: Ans

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: U-238 decays with the half-life of 4.47 billion years. Calculate the % of a sample left after 13.4B…

A: Given : Half life = 4.47 billion years  Time = 13.4 billion years.

Q: The half-life of strontium-90 is 28 years. H

A: Given t1/2 of a reaction is 28 years  decay constant  (λ) λ = 0.693t1/2     = 0.69328 y     =…

Q: CHAPTER TEN RATES OF REACTIONS AND FACTORS AFFECTING IT The half-life of bismuth-212 is 1 hour. If…

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Q: The isotope nickel-63 has a half-life of 100 years. If a tested sample has five grams of nickel-63…

A:

Q: Iodine-131 used to treat hyperthyroidism, has a half-life of 8.04 days. For a sample containing 10.0…

A: Half life time = 8.04 days  Initial mass = 10.0 μg  Time = 32.2 days Mass remain after 32.2 days = ?…

Q: An unknown radioisotope exhibits 8540 decays per second.After 350.0 min, the number of decays…

A: Nuclear reactions are a type of chemical process which lead to the formation of some new nuclei with…

Q: How long for Ce-144 (half-life: 280 days) to decay down to 0.50% of its original amount?   2,100…

A:

Q: PLutonium-239, one of the radioactive by-products of nuclear power, represents a serious was…

A: Chemical kinetics is the study of the reaction that how fast or slow a reaction is taking place. The…

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

A: Given-> Half life (t1/2) = 28.1 year  Initial amount = 4.00 gm Final amount = 0.100 gm

Q: Another form of radiometric dating is potassium-argon dating, which tracks the ratio of Ar-40 to…

A: Any reaction following "first-order reaction", that reactions rate always relies over single…

Q: (19] There are 40 grams of radioactive substance at one point in time. After two hours, only 30…

A: The half-life of a quantity is the amount of time it takes to decrease to half of its original…

Q: If 7.0 grams of a sample decays to 0.44 grams in 2.0 hours, what is the half-life time of the…

A: For calculation of half life first of all we need rate constant of the reaction, which can be…

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A:

Q: A certain isotope has a half-life of 2.00 days. How much of a 4.00g sample of this isotope will…

A: Since the decay reactions are first order reactions Hence we can say  1) Half life = ln(2) / K 2)…

Q: c) What percentage of the isotope will remain after 115 days lfur 25. alpha beta and

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

A: Given :  Half life = 28 years

Q: Th-234 has a half-life of 24.1 days. If a 355 mg sample is initially present, how many half-lives…

A: Given  Half life ( t1/2 )  = 24.1 days  Initial amount  = 355 mg  Time ( t ) = 96.4 days  Number of…

Q: Suppose a sample of a certain substance decayed to 73.4% of its original amount after 300 days.…

A: Since, you have not mentioned about the order of the reaction, I have assumed it to be the 1st order…

Q: How long will it take before twenty percent of our 1,000-gram sample of uranium-235 has decayed?…

A: The radioactive reactions are first-order reactions. The equation used for the first-order reactions…

Q: If a rock sample was found to contain 4.65 x 10 mol of argon-40, how much potassium-40 would also…

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Q: A rock had originally 4500 atoms of U-238 and no Pb-206. U-238 decays into Pb 206 with a half life…

A: The age of the rock has to be determined

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Q: A sample initially contains 60.0g of thorium-234. After 48 days 7.8g of thorium-234 remains…

A: The half lifetime t12of a radioactive compound is the time when it disintegrates to its half of the…

Q: The half-life of cobalt-60 is 5.27 yr. How much of a 1.000-mg sample of cobalt-60 is left after…

A:

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: Suppose the amount of a certain radioactive substance in a sample decays from 7.40 mg to 4.60 mg…

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Q: Phosphorus-32 is a radioisotope used to detect certain types of tumors. P-32 has an effective…

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A: Given: Mass of Na332PO4 = 175 mg = 0.175 g                                       (Since 1 g = 1000…

Q: The half-life of tritium is 12.4 years. How long will it take for 15% of a sample of tritium to…

A: The radioactive decays are first order reaction.

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

A:

Q: approximately 25,000 years. How many undecayed nuclei remain after 100,000 years? b) calculate the…

A: We will use first order kinetics formula

Q: If a rock sample was found to contain 4.30 x 10-7 mol of argon-40, how much potassium-40 would also…

A: Nuclear disintegration follows first order kinetics  λ=2.303 log(A0/A)/t  λ=0.693/t1/2 or 0.693/t1/2…

Q: 234 Calculate how long it will take for a sample of 4Th with a half-life of 24.1 days to decay to…

A: Since , you have posted multiple questions, we will solve the first question for you .If you need…

Q: Strontium-90 (90Sr) is a radioactive isotope with a half-life of 28.8 years. What percentage of this…

A: The radioactive disintegration falls in the type of first-order kinetics where reaction rate…

Q: If 28.0% of a sample of technetium-99 decays in 2.84 hours, what is the half-life of this isotope…

A:

Q: A volcanic eruption melts a large chunk of rock, and all gases are expelled. After cooling, argon-…

A: (half-life of potassium-40 is 1.25 x 10° yr) is wrong it should be 109 (half-life of potassium-40 is…

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: An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 484 g…

A: Nuclear decay follows 1st order reaction.  Given the half-life of C-14, t1/2 = 5730 year…

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: n unknown radioactive element decays into non-radioactive substances. In 440440 days the…

A: a) Given :-  Given that, in 440 days the radioactivity of a sample decreases by 37 percent.  i.e.…

Q: Iodine-131 is a radioactive isotope. After 2.00 days, 84.2% of a sample of 13I remains. What is the…

A: Iodine- 131 is an radioactive isotope. Time = 2 days Final concentration of 131l  = 84.2% of sample…