40K decays to 40Ar with a half life of 1.27x10^9 years. What is the age of a rock in which the weight ratio of 40Ar to 40K is 6.7?

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

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Q: Suppose the amount of a certain radioactive substance in a sample decays from 4.60 mg to 1.90 mg…

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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: 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: The half-life of radioactive chromium-51 is 28 days, If a sample of chromium-51 has a mass of 12.0…

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Q: The half-life of a decaying radioactive isotope is the time it takes for half of the original mass…

A: Here we are required to find the half life of the radio isotope

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: The rate constant for a certain radioactive nuclide is 9.8 x 10-3h-1 . What is the half-life of this…

A: The rate constant for radioactive nuclide is given as 9.8 x 10-3h-1. All the radioactive decays…

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

A: Half life of radioactive elements is given by    t1/2 =0.693λ      λ = disintegration constant.…

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: 7. The age of an ancient tree trunk is estimated using radiocarbon dating. If the tree gives 3.75…

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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: Half-life of Cs is 30.2 years. Intial amount sample = 100 g  Final amount sample = 1.00 g

Q: The half-life of a radioactive isotope is 13 seconds. How long does it take for 100 mg of the…

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

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Q: 8. How long will it take for a sample of plutonium -239 with a half-life of 24000 years to decay to…

A: Given information : plutonium-239 Half life (t1/2) = 24,000 years Initial amount = Ao Final amount…

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: A 40.0 mg sample of a radioactive substance decays to 10.0 mg in 10 days. What is the half-life of…

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Q: A

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Q: a substance with a half-life of 23.1049 seconds. you start with 12 mg of the substance (a) write the…

A: The decay of substance follow exponential rule. Half life is defined as the time required by any…

Q: If half-life of carbon-14 is 5730 years, estimate the age of a bone containing 75% of its original…

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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: A certain radioisotope has a half-life of 6.58 days. What percentage of an initial sample of this…

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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…

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Q: A rock was dated using Carbon-14 (half life = 5730 years). If the percentage of the parent atoms…

A: Given data contains, Half-life of C-14 is 5730 years. Percentage of parent atoms is 12.5%. N0 is…

Q: The noble gas radon has been the focus of much attention because it may be found in homes. Radon-222…

A: Half life time = 3.82 days  Concentration decreases to 10% of original.  Let initial concentration =…

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

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

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

A: Radioactive decay reactions are first order reactions. The calculation can be done using first order…

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

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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: 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…

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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: A substance X initially weights 56 grams. After 6 minutes, it was observed that its mass decreased…

A: Mass at starting (t=0) = 56 grams Mass after 6 min = (56-12) g                                = 44 g…

Q: ubidium-87 decays by B production to strontium-87 with a half life of 4.7 x 1010 years. What is the…

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Q: what is the half life of an isotope that decays to 25% of its original activity in 68.9 hours?

A: For a first order reaction, rate constant can be calculated as

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

A: Half-life of Ra-223 = 11.4days Mass of Ra-223 = number of moles of Ra-223 × Molar mass of Ra-223…

Q: decay

A: T1/2 = 28 yrs N = 0.40 g No = ? at T = 56 years

Q: The half-life of stroncium-90 is 28 years. How long will it take a 50-mg sample to decay to a mass…

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Q: Carbon-14 has a half-life of 5730 yearsyears. In a plant fossil, you find that the 14C14C has…

A: Given data:

Q: A theoretical isotope known as Du-30 has a half life of 6 months. The amount decreased from 1.50M to…

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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…

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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: A 10.00-g plant fossil from an archaeological site is found to have a 14C activity of 3094…

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Q: Zinc-62 decays with a half-life of 9.186 hours. 1. Write the balanced nuclear reaction of Zn-62 as…

A: As per the rules, only three sub-parts can be answered:

Q: The half life for the decay of carbon-14 is 5.73 x 10° years. Suppose the activity due to the…

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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…

Q: What is the half-life of magnesium-20 if 1.24 seconds are required for the activity of a sample of…

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.