15) What is the decay constant for 1311 if the half-life is 8.04 d? A) 9.31 x 10-5 s-1 B) 4.81 x 10-4 s-1 C) 3.48 x 10-6 s-1 D) 9.98 x 10-7 s-1

Q: Neptunium-237 was the first isotope of a transuranium element to be discovered. The decay constant…

A:

Q: Question attached

A: Given:-               The first order reaction formula is: Half life T12 = 13.27 hours…

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A: Given: a) Fraction of Carbon-14 in a piece of charcoal after 10.0 yr is calculated as shown below,

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A: Decay reactions are first order reactions. Given : Decay constant = 9.94 X 10-7 s-1

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A: As radioactive decay is a first-order process and can be described in terms of either the…

Q: What was the original mass of a sample if 0.0750 grams remain after 11.47 days?

A: Given, The half life of Rn-222 is 3.823days.   0.0750 grams remain after 11.47 days  The original…

Q: 9.) Strontium 90 is a major component of the detonation of nuclear explosives: it is I dangerous…

A: We know that no of atoms  N Present at time t  are given as N= N° e-kt where N° are the initial…

Q: c- A freshly prepared sample of a certain radioactive isotope has an activity of 10 mCi. After an…

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Q: 25. How long would it take for 2.8 micrograms of a 10.4 microgram sample of Pa-231 to decay? The…

A: A multiple choice question based on half-life period, which is to be accomplished.

Q: Cobalt 60 has half-life of 5.25 years. Given 1 mg of the substance, find  (b) the decay constant,…

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Q: 27, What decay mechanism is involved in the transformation of 1Au to r? 179 decay decay b. +B decay…

A: Nuclear reaction: The given reaction is a nuclear reaction. In the nuclear reaction, one nuclide is…

Q: 22. What is the half-life of a radionuclide with a rate constant of 0.0016/s? [A] 0.0023 s [B] 430 s…

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 molybdenum-99 is 67 h. A 200 microgram (mg)quantity decays, over time, to 25 mg.…

A: Solution :      The half-life of a reaction is defined as the time required to reduce the…

Q: 1. Co decays with a half-life of 5.27 years to produce 2Ni. (a) Calculate the fraction of a sample…

A: Given a radioactive decay of cobalt to nickle. All radioactive decay follow first order kinetics…

Q: The decay constant for the element X is 6.931 yr⁻¹. What is the half-life?

A: Relation between decay constant (K) and half life (t12) of an element:-t12 =0.693K

Q: How many half-lives have passed in each of the following situations? (a) Initially the sample is…

A: SOLUTION: Step 1: (a). Half-life is the interval of time required for one-half of the atomic nuclei…

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A: We need to find out how long ago the mammoth lived.  We are given the carbon-14 decay rate i.e.…

Q: What is the half‑life of an isotope that decays to 6.25%6.25% of its original activity in 24.2…

A: The half-life  is the time it takes for the concentration of that substance to fall to half of its…

Q: 8. Radioactive Iodine-131, with a half-life of eight days, is a common fission product and thus is…

A: The expression for the first order radioactive decay is shown below: Where; t = time A0 = initial…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.80 billion years old by…

A:

Q: 53. If 87.5 percent of a sample of pure 131I decays in 24 days, what is the half-life of 131I?  (A)…

A: We can evaluate the answer either conceptually or by mathematical procedure. We shall use pure…

Q: 24 Am is used in many home smoke alarms. It has a decay half-life of 457 years. How long does it…

A: All radioactive decay follows first order kinetics. So in order to solve for the time required we…

Q: 1. This question is about nuclear chemisty. a) What is the age of a mummy, given a 14C activity of…

A: (a) To find the age of mummy, Given that: Current 14C activity = 8.5 min-1 g-1 Activity just before…

Q: The half-life of 90Sr is 28.8 years. How long will it take (in years) for a 86.1 mg sample of 20Sr…

A: Given t= 28.8 years. t1/2 = ?

Q: Fluorine-18 (5F) has half-life t/2 = 110. minutes. (a) What percentage of *F-sample remains after…

A: Given,          Half life of the element (t1/2) = 110 minutes = 110 x 60 s = 6600 s          Time…

Q: The half-life of 1311 is 8.04 days. (a) Convert the half-life to seconds. (b) Calculate the decay…

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Q: Americium-241 is used in smoke detectors. If 15% of the americium-241 in a smoke detector decays in…

A:

Q: Cobalt-60 is radioactive and has a half life of 5.26 years. How long would it take a sample to decay…

A: Given- Half life=5.26 years  Initial amount=1.90mg Final amount=1.50mg

Q: One gram of a sample of Bi decays to 0.25g after 10 days. The half life ofBi in 83 83 days is A 3 B…

A:

Q: Phosphorus-32 is a radioactive isotope with a half-life of 14.3 d (d = days). A biochemist has a…

A: Radioactive decomposition follows first order kinetics. Integrated rate law for first order is

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A: Radioactive decay is related to first order kinetics. For first order reaction: First order…

Q: Bromine-88 is radioactive and has a half life of 16.3 seconds. What percentage of a sample would be…

A: Given,Half-life of Bromine-88 = 16.3 seconds.Percentage of sample left after 74.8 seconds has to be…

Q: 225 Ac 9.9 d 221Fr de days 4.8 m h hours meminutes Sseconds ms milliseconds usmicroseconds X1 32 ms…

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

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Q: How long does it take for 87.5% of each isotope to decay? Kr-91 Kr-89 min Kr-79 h Kr-81 yr

A: A radioactive isotope's half-life is the time taken for one-half of the isotope to decay. A…

Q: 14Cdecays by B-emission and after 12.0 h, ninety percent of the radioactive substance remains.…

A:

Q: If a 40.00 mg of I-131 decays 20.00 mg in 10 days and in another it would decay to 10.0O0 mg, what…

A:

Q: The isotope 32P emits radiation and has a half-life of 14.3 days. Calculate the decay constant in…

A: Solution -

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: The radioactive isotope 212Pb has a half-life of 10.64 h. A sample containing this isotope has an…

A:

Q: Calculate how long will it take for a sample of a radionuclide with a half-life of 39.9 days decay…

A:

Q: 8.0mg of a radioisotope of half-life 30 minutes is used for 12 minutes. What is the amount of the…

A:

Q: 14.20 60Co is used extensively in medicine as a source of y-rays. Its half-life is 5.27 years. (a)…

A:

Q: Part A: In the reaction shown, three half-lives have passed Part B The half-life of phosphorus-32…

A: Interpretation -  As in the reaction shown that three half lives are passed if the half life of…

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.