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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: 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…

A: The half-life of a radioactive isotope (t1/2 ): All radioactive decay first-order reaction kinetics.…

Q: The half-life of cesium-129 is 32.0 hours. How much time is required for the activity of a sample of…

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

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

A: Given , half life of U-235 = 703 million years. We need to find the time at which the amount of…

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 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: 4. Radon-222 has a half-life of 2.8 days. How many half-lives will pass after 28 daysa O 19 O 5 O 10…

A: Given that: half life of Rn = 2.8 days To find: How many half life will pass after 28 days?

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: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A: Since this is a first order decay The rate constant with half life is given by…

Q: The half-life of cesium-129 is 32.0 hours. How much time is required for the activity of a sample of…

A: Given  Half life of cesium - 129 =  32 hours  Remaining activity [ A ] = 14.5 %  Time ( t ) = ?

Q: A rock is found to have 12.75 mg of 238U and 1.19 mg of 206 Pb. Determine the age of the rock. The…

A: Age of rockT = (2.303 / ) *log (No/N) Where   = 0.693/t1/2Where,No is the initial quantity of 238U…

Q: A radioactive isotope has a half-life of 11 minutes.  How many grams of a 18.68 g sample remain…

A: Given Half life = 11minutes = 11*60= 660 second Sample weight = 18.68g Time = 44 minutes = 44*60=…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.00 billion years old by…

A: Step 1:The U.S Apollo mission is estimated to be 4 billion years old.Mass of U238  is 1.245gHalf…

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

A: We have to predict the time taken.

Q: What is the half-life of thallium-210 if 2.40 minutes are required for the activity of a sample of…

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Q: 210Rn has a half-life of 2.4 hours. You have a sample that contains 24 g of 210Rn. How much 210Rn…

A: The relationship between the half-life, T1/2 and the decay constant is given by  or,  The…

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

A: The half life of the iodine -131 = 8.04 daysThe time required for sample to reduce to 6.14 % of…

Q: The half-life of Polonium-218 is 3.00 minutes.  How many half-lives pass after 18.0 minutes ?  The…

A: Concept - Radioactive decays are first order reactions. So we use the formula, Nt = No(1/2)n, where…

Q: PET scans require fluorine-18, which is produced in a cyclotron and decays with a half-life of 1.83…

A: Given: Half life, T1/2 = 1.83 hrVelocity of transport, v= 60.0 miles/hrfinal Concentration of F-18 =…

Q: The radioactive isotope Sr decays by electron capture. If the mass of a sample of strontium-80…

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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: Iodine-125 (125I) is used to treat, among other things, brain tumors and prostate cancer. It decays…

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Q: The half-life of 51Cr is 2.78×101 day. Calculate how much time it would take for an isolated…

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Q: Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0 grams to decay to 10.0…

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Q: 11047Ag → 0.je + 110 48Cd For the nuclear reaction Starting with 200. g of Ag-110 in a container,…

A: Since you have asked multiple question, as per our company guidelines we are supposed to answer the…

Q: The half-life of oxygen-15 is 124 ss. If a sample of oxygen-15 has an activity of 4800 BqBq, how…

A: Half-life of a reaction is the time at which the initial concentration of the reactant becomes half.…

Q: Enter your answer in the provided box. A rock sample originally contains 4.79 mg of 238U. How much…

A: The question belongs to Nuclear Chemistry. We need to find how much lead will be in the rock sample…

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: A 993.3 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

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Q: If the half-life of iodine-131 is 8.10 days, how long will it take a 50.00 g sample to decay to 6.25…

A: Given - Half life of iodine -131 =8.1 0 days  Initial weight of sample= 50.00 gram  Final weight of…

Q: that reads 452 g. How much sample is left after half an hour? 5.00 g 90.4 g 14.1 g 75.3 g

A:

Q: The​ half-life of​ silicon-32 is 710 years. If 20 grams is present​ now, how much will be present…

A: Radioactive decay is always a first order reaction. The rate equation for the radioactive decay is :…

Q: A 604.7 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

A:

Q: The half-life of cesium-129 is 32.0 hours. How much time is required for the activity of a sample of…

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Q: The half-life of radium is 1620 years. If a laboratory has 32 grams of radium, how long will it take…

A: Data

Q: What is the half-life of gallium-74 if 32.1 minutes are required for the activity of a sample of…

A:

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.