A sample initially contains 60.0g of thorium-234. After 48 days 7.8g of thorium-234 remains determine the half-life of thorium-234?

Q: How long does it take for a radioactive substance to decay from 360 cps to 11.25 cps if the…

A: Half-life is the time required for the reaction to be half completed. It is denoted by t1/2 . For a…

Q: The half-life of Phosphorus-32 is 14.3 days. If you start with 100 grams of it, how long will it…

A: Half life of a first order reaction is given by , t1/2=0.693k Write the expression for first order…

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

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Q: Consider a radioactive sample with a half-life of one week. How much of the original sample will be…

A: Half-life period is defined as the time taken for amount of the sample to reduce to half of its…

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: Beginning with 1.00 g of a sample of an unknown radioactive isotope, 0.05674 g of the isotope will…

A: The answer to the following question is-

Q: A sample of polonium-210 has a half-life of 138 days a)What fraction of polonium-210 remains after…

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Q: A pure sample of tritium, 3H, was prepared and sealed in a container for a number of years. Tritium…

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Q: The half-life of 238U is 4.5 * 109 yr. A sample of rock of mass 1.6 gproduces 29 dis>s. Assuming…

A: The given data contains, mass = 1.6 g. half life=4.5×109 year.

Q: The half-life of Oxygen-14 is 1.177 minutes.  You originally have 20 grams of it.  After roughly 3.5…

A: Given: Half-life of Oxygen-14 is 1.177 minutes Mass of Oxygen-14 is 20 g

Q: Age of the Earth. Suppose that at the formation of the Earth there were equal amounts of 235U and…

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Q: PET studies require fluorine-18, which is produced in a cyclotron and decays with a half-life of…

A: The maximum distance that the cyclotron can be transported has to be given,

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: Enter your answer in the provided box. A rock sample originally contains 3.20 mg of 238U. How much…

A: Given data  Initial amount of 238U : No= 3.20 mg final amount of 238U : N = ? mg half life  : t1/2 =…

Q: The half-life of radioactive radium (226Ra) is 1599 years. What percent of a present amount of…

A: Chemical changes in which species amount varies linearly along with time basically obey"first-order…

Q: If 50% (1/2)of a radioactive element remains after 4000 years, what is the half-life

A: Half life of a radioactive element is the time required to disintegrate into it's half…

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

A: Given,

Q: I-131 has a half-life of 8.04 days. If a sample initially contains 20.0 g of I-131, approximately…

A: Interpretation -  To determine the amount of I-131 after 32 days when I-131 initially contains 20g…

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: A sample of Uranium-234 has been decomposing. If the original mass of 234U is 2.57milligrams, how…

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Q: How much of a 24- gram sample of Radium -226 will remain unchanged at the end of three half- life…

A: Radium-226 is a radioactive element. Here 24 g of the radium sample undergoes radioactive decay. The…

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: 2. The radioactive potassium-40 isotope decays to argon-40 with a half-life of. a. Write a balanced…

A: t1/2 = 1.2 x 109 year Initial Mass of K = 100 g Remaining Mass = 18 g

Q: A The balf-life of barium-131 is 12 days. How many grams remains after 60 days if the initial sample…

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Q: It takes 870.98 years for carbon-14 to decay to 90 mg. What is the half life of carbon-14?

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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…

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Q: A radioactive sample initially contains 2.40×10^−2 mol of a radioactive material whose half-life is…

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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: The radioactive substance neptunium -139 decays to 72.85% of its original amount after 28 hours. How…

A: For radioactive decay, relation between rate constant and its concentration is give below.…

Q: If a rock sample was found to contain 1.27 x 10-7 mol of argon-40, how much potassium-40 would also…

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Q: One of the nuclides in spent nuclear fuel is U-235, an alpha emitter with a half-life of 703 million…

A: Using the given half-life period, rate constant, k can be determined.

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: The half-life of Oxygen-15 is 2 minutes. What fraction of a sample of O-15 will remain after 5 half…

A: Given,half-life = 2 minutesNeed to find out the fraction remaining after five half-lives.

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

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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…

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

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: How much of a 0.15 g sample of U-238 after the passage of 3200 years? Half-life is 4.01x10^9 years.

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Q: The half-life of radioactive strontium-90 is 28.8 years. How long would it take when only 16.5% of…

A: The half-life of strontium-90 is = 28.8 years Time would it take when only 16.5% of the original…

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 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: After 119 days have elapsed, 1/21 of a radioisotope sample remains undecayed. What is the half-life…

A: Suppose the initial amount of sample be Ao After 119 days, amount remaining, A = (1/21) Ao The…

Q: What is the half-life of uranium-238 if 9.10×109 years are required for the activity of a sample of…

A: Given: 9.10×109 years are required for the activity of a sample of uranium-238 to fall to 24.7…

Q: the half-life of aluminum 26 is .74 million years. Suppose an asteroid contained 800 kg of aluminum…

A: The half-life of aluminum 26 is 0.74 million years. The mass of aluminum 26 present in asteroid is…

Q: A sample of Thorium-228 has a half-life of 1.9116 years. What percent of Thorium-228 remains after…

A: Applying basic concept of radioactivity.

Q: One of the nuclides in spent nuclear fuel is U−234U−234, an alpha emitter with a half-life of…

A: Welcome to bartleby !  We have to calculate time (years)