Iodine-131 is a radioactive isotope. After 2.00 days, 84.2% of a sample of 13I remains. What is the half-life of 13119 days

Q: The half-life of nucleus Rn-222 is 3.88 days. How many mg of a 5000 mg sample of Rn-222 remains…

A: The half life of a given reaction refers to the time required by a given compound to reduce to half…

Q: It takes 4 h 39 min for a 2.00-mg sample of radium-230 to decay to 0.25 mg. What is the half-life of…

A: Half life of first order kinetic reaction is given by:

Q: (11) Lead-211 is a radioactive isotope with a half-life of 36.1 minutes. How long will it take for…

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

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Q: What is the half-life of a radioactive substance if after 5 years 95 percent of an initial amount…

A: Half life of a given radioactive substance is that time duration in which it's amount reduced half…

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: While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73…

A: Solution Tc ninety nine m is wide used for diagnostic and therapeutic functions. It emits gamma…

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: Thorium, a rare element in the earth's crust, has over seven radioactive isotopes. Of of these Th…

A: The rate of the reaction is referred to the change in the molar concentration in the distinct…

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: Iodine-131 has a half-life of 8 days. What fraction of the original sample would remain at the end…

A: Half life is the period at which concentration of reactant reduces half of its original value.

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

A: The radioactive decay always follows the first order kinetics. The radioactive decay of I-125 must…

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: 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: Carbon-11 is a radioactive istope of carbon. Its half-life is 20.3 minutes. What fraction of the…

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Q: Iodine-131 has a half-life of 8.0 days. How long will it take 10 μg of 131I to decrease to 1/100 of…

A: We have given the half life of 131I that is t1/2 = 8 days from this we can find the out the decay…

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: Americium-241 is a radioactive isotope that is used in smoke detectors. It has a half-life of 432.2…

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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: Potassium-40 decays to argon-40 with a half-life of 1.27 * 109 yr. What is the age of a rock in…

A: It is given that potassium-40 decays to Argon-40 and has a half-life of 1.27×109 years and the mass…

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

A: Given, Half Life , t1/2 = 28 days First, calculate rate constant ,K to calculate time (t)

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: 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 18.9% of a sample of zinc-65 decays in 73.5 d, what is the half-life of this isotope (in days)?

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Q: The half-life of nucleus Rn-222 is 3.88 days. How many mg of a 5000 mg sample of Rn-222 remains…

A: Given, half-life of nucleus is 3.88 days.  The half-life can be calculated by the expression given…

Q: Phosphorus-32 is a commonly used radioactive nuclide in biochemical research, particularly in…

A: Answer: Given data: t1/2=14.3dayst=33.0days Mass of sample m=188mg

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: The half-life of radium 226 is 1602 years. If you have 500 grams of radium today how many grams…

A: This is a first order reaction where the radioactive substance disintegrates. The half life time of…

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: If a tree dies and the trunk remains undisturbed for 1.775 × 10⁴ years, what percentage of the…

A: Given-> Half life = 5730 year  Time = 1.775 × 104 year.

Q: The half life of the radioactive element ubtonium-31 is 10 seconds. If 80 grams of unobtanium-31 are…

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

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Q: After four half-lives, the fraction of a radioactive isotope that still remains is approximately 1/4…

A: We know that, after 1 half-life, clearly HALF of the original isotope remains.

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

A: Radioactive decay is always a first order reaction. According to the first order radioactive decay…

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: E Reae The half life of chromium-51 is 27.8 days. How many days are required for 15/16 of a sample…

A: Chemical Kinetics  1st order Kinetics  Nuclear Decay  Step-2 Has further calculation

Q: A sample of radioactive radon-222 was found to have a half-life of 3.823 days. What fraction of 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: The radioactive nuclide Plutonium-199 has a half-life of 43.0 min. A sample is prepared that has an…

A: Half-life of radioactive substance: T1/2 = 43.0 min Initial activity of radioactive substance: AO =…

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: decay

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

Q: If a tree dies and the trunk remains undisturbed for 1.635 × 10⁴ years, what percentage of the…

A: Given, time t = 1.6 x 104 years , half life t1/2 = 5730 years

Q: The half life of radium-226, the first radioactive element discovered, is 1,620 years. If a sample…

A: Radioactive reactions are of first order. The relationship between half life t1/2 and rate constant…

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.