a rock conatains 0.257mg of Pb-206 for every milligram of U-238. The half-life for the decay of U-238 to Pb-206 is 4.5 x 109. How old is the rock?

Q: The half-life of strontium-90 is 28.0 years. How many grams of this nuclide in a 4.60-g sample will…

A: Half-life time t12=0.696k;   k is decay constantandt=1kln(m0m)m0 is mass of at time t=0m is mass of…

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: 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 radium-226 is 1.60X10³ yr. How manyhours will it take for a 2.50-g sample to decay…

A: Given :  t1/2 = 1.60 x 103 yr , [A0] = 2.50 g , [At] = 0.185 g Half-life : The time taken by any…

Q: 5. The half life of radioactive 32P is 14.3 days. How long does it take for 100 mg of this isotope…

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

A: Half life = 28.1 year Initial amount = 1.50 gm Final amount = 0.100 gm

Q: Iron-59 is commonly used as a source of B particles. How long does it take for 87.5% of a sample of…

A: Radio active decay is an example of 1st order reaction. and for 1st order reaction the rate law is…

Q: on 5 A The nuclide As-76 has a half-life of 26.0 hours. If a sample of As-76 weighs 344 g, what mass…

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

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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: On irradiation of a radioactive element with neutrons, a radiochemist discovered a new nuclide…

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Q: The half-life of radium-226 is 1.60 × 10' yr. How many hours will it take for a 2.50-g sample to…

A: The decay reactions are first order reactions. Hence for the first order reactions we can say that…

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: 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: 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: A radioactive sample contains 9.5 x 1017 atoms of a nuclide that decays at a rate of 5.4 x 1013…

A:

Q: If 28.0% of a sample of sodium-24 decays in 7.11 hours, what is the half-life of this isotope (in…

A: Given data,  Let, Initial amount of sample is [A]o=100% 28 % of sample is decay so remaining amount…

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: 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: NUCLEAR REACTIONS Zinc-62 decays with a half-life of 9.186 hours. 1. Write the balanced nuclear…

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Q: In a sample of a radioactive isotope, 20.0 % has decayed after 30.0 days. Calculate the half-life of…

A: The nuclear reactions are a type of chemical processes which lead to the formation of some new…

Q: Carbon-14 has a half-life of 5,730 years. If a sample contained 70 mg originally, how much is left…

A: Carbon-14 has a half-life of 5,730 years. If a sample contained 70 mg originally, how much is left…

Q: he half-life of radioactive Bk-248 is 23.7 h.   How long does it tak

A: Radioactive decay follows the first order kinetics  its decay constant   λ = 2.303t log NoNwhere…

Q: 20. lodine - 125 emits gamma rays when it decays to Tellerium-125 and has a half-life of 60 days. If…

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

A:

Q: 2. The isotope cesium-137 has a half-life of 29.75 years. How long will it take a 100 gram sample of…

A: First-order reaction: The type of reaction which depends only on one substance is called a…

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: What is the half-life of an isotope that decays to 6.25% of its original activity in 68.3h?

A: Radioactive decay is a first order reaction. For a first order reaction, rate constant can be…

Q: Strontium-90, a beta emitter, has a half-life of 28.1 yr. If 29.1 mg of 90Sr were incorporated into…

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Q: What is the half-life of iron-55 if 5.93 years are required for the activity of a sample of iron-55…

A:

Q: Proton-85 has a half-life of 10 years. Approximately what percentage of Kr-85 produced from the…

A: Half life of Kr-85 = 10 yr % of Kr remain active = ?

Q: The half-life of Ga-67 is 77.9 hours. How long will it take Ga-67 to decay and lose 95% of its…

A:

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

A:

Q: If a tree dies and the trunk remains undisturbed for 1.170 × 10' years, what percentage of the…

A: This is a first order reaction. t½ = 0.693 ÷ k 5730 = 0.693 ÷ k k = 1.21 × 10-4  year-1 where k is…

Q: The half-life of cobalt-60 is 5.3 years. How long will it take for a 1.000-mg sample of cobalt-60 to…

A: Given: The half-life of Co-60 is 5.3 years. The initial amount of Co-60 is 1.000 mg. The amount of…

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: The half-life of Ga-67 is 77 9 hours. How long will it take Ga-67 to decay and lose 95% of its…

A:

Q: What is the half-life of chromium-56 if 12.8 minutes are required for the activity of a sample of…

A: Radioactive decay follow first order kinectics . Half life for first order reaction  = 0.693/k  k is…

Q: If 25%(1/4)of a radioactive element remains after1,000years, what is the half-life?

A: Radioactive elements are those elements whose nuclei are highly unstable and hence undergo…

Q: If 28.0% of a sample of copper-64 decays in 6.16 hours, what is the half-life of this isotope (in…

A: We will use formula of rate constant first order kinetics

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: How many hours are needed for a 16.0 g sample of Si-31 to decay to 2.0 g? The half-life for Si-31 is…

A: Solution -

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

A:

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: 4. After 2 hours, tantalium-172 has 1/16 of its initial radioactivity. How long is its half-life?

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Q: A volcanic eruption melts a large chunk of rock, and all gases are expelled. After cooling, argon-40…

A: Half-life of potassium-40 = 1.25 x 109 year A = The final amount of 40 K left = 1.38 mmol  A0 =…

Q: what is it's half-life?

A:

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