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

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

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Q: a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an initial sample of 33 grams,…

A: Reaction in which rate is linearly depend upon one reactant is known as first order reaction.

Q: o-60 is used extensively in radiotherapy as a source of y-rays. Its half-life is 5.27 years. a) How…

A: Elements which are not stable gain stability by emitting rays, this type of elements are called…

Q: 137 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A:

Q: Cobalt-60, used in cancer therapy, decays by beta and gamma emission. The decay constant is 4.18 x…

A: Half-life is the interval of time required for one-half of the atomic nuclei of a radioactive sample…

Q: 6. Cobalt-60 is used extensively in medicine as a source of gamma ray. Its half life is 5.27 years.…

A: Nuclear reaction follows first order kinetics. Write the equation for calculating rate constant of a…

Q: Sodium-24, which is used to locate blood clots in the human circulatory system, has a half-life of…

A: Half life period: The time required to decay half of the initial amount is known as half life…

Q: The half-life of Uranium-238 is approximately 4.5(10°) years. How much of a 10 kilogram block of U-…

A: Given data :- Half life = 4.5 x 109 years mass of uranium = 10 kg

Q: The half-life of a certain radioactive isotope is 20 days. How long does it take for 50g of the…

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Q: 187 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Given datas –  t1/2 = 30.2 years  t = ?  [A0] = 100.0 g  [At] = 1.20 g

Q: The half-life of Radium-226 is 1600 years. If 30 grams are left after 8,030 years, how many grams…

A: Radioactive decay follows first order kinetics.  k = 0.693/t0.5  Or, k = 0.693/1600 year^-1 =…

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

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Q: 137 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Data given,  Half-life period of 137Cs, t1/2 = 30.2 years Initial amount, No = 100.0 g Amount left,…

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: Cs-134 has a half-life of 2.0 years. How much of a 2.50-g sample of this isotope will remain after…

A: Given :- half life of Cs-134 = 2.0 years                Initial amount of sample = 2.50-g  To…

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: The half life of an isotope is 43 seconds. How long does it take 100.0g of that isotope to decay to…

A: Half life = 43 second k = 0.693half life= 0.69343 sec=0.016 s-1

Q: The half-life of cesium-137 is 30 years. Suppose we have a100-mg sample.(a) Find the mass that…

A: (a) Given half life of cesium- 137 = 30 years. For calculating mass after t years, Formula for…

Q: The half-life of tritium is 12.3 years. If 48.0 mg of tritium is released from a nuclear power plant…

A: Given data contains, Half-life of tritium is 12.3 years Mass of tritium is 48.0 g Time t is 5.0…

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

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

A: Given :  Half life = 28 years

Q: The number of a certain radioactive nuclide present in a sample decays from 59,122 to 429 in 9.23…

A: Given: No=59122Nt=429t=9.23 days Half life of the radioactive species refers to the time required to…

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…

A:

Q: 187 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A:

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

A:

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

A: The relationship between the decay constant and the half-life period is given below.

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: 137 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A:

Q: 8. A radioisotope is going to be used in an experiment. At the end of 10 days, only 5% is to be…

A:

Q: How long long does it take for 78 % of sample of cobalt-60 to decay (the half life is 5,26 years)?

A: The rate of a reaction is expressed as: Rate = k[A]n where k is the rate constant, [A] is the…

Q: The half-life of cesium-137 is 30.2 yrs. If the initial mass of a sample is 1.00kg, how much will…

A:

Q: 187 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Half life means time takwen by the sample to reachhalf of its concentartion.  Remains afetr t time =…

Q: 13' Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

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…

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Q: Radium-223 decays with a half-life of 11.4 days. How long will it take for a 0.240 mol sample of…

A:

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: 137 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A:

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: 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: 3. Suppose a sample of carbon-243 has a half-life of 3427 years. How long does it take for 80% of a…

A: In this question, we have to find out the correct answer of given problem by the help of the…

Q: Cs – 137 has a half life of 30.2 years. How many years will it take for a 100.0 g sample to decay to…

A:

Q: . If Gallium-68 has a half-life of 1.13 hours, how much of a 10.0 mg sample is left after 5.69…

A: 1.  given :-  initial amount of sample = 10.0 mg  half life of Gallium-68 (t1/2) = 1.13 hours  To…

Q: Ca-60 is used extensively in radiotherapy, its half-life is 5.27 years. How many years will it take…

A: The given data is as follows: The half life Co-60 = 5.27 years The initial amount A∘= 100 The left…