A sample of iodine-126 with an original mass of 15.00 mg loses 13.125 mg of the original mass of the isotopes in 39 days.  What is the half life of iodine-126.

Q: The half-life of bismuth-210, 210Bi, is 5 days.(a) If a sample has a mass of 200 mg, find the amount…

A: Solution-  (a)-The half life periods of Bismuth-210 is 5days.the rate of decay of any substance…

Q: 2. A sample of iodine-126 with an original mass of 15.00 mg loses 13.125 mg of the original mass of…

A: When the quantity is reduced to one-half of the original of a radioactive sample, then the time…

Q: The half-life of bismuth-210, 210Bi, is 5 days. (a) If a sample has a mass of 216 mg, find the…

A: The decay of radioactive elements follows first order kinetics. So we would use first order reaction…

Q: The half-life of 234U, uranium-234, is 2.52 105 yr. If 98.9% of the uranium in the original sample…

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Q: The Br-82 nucleus has a half-life of 1.0 x 103 min. If you wanted 1.0 g Br-82 and the delivery time…

A: The radioactive decay of Br-82 is an example of first order reaction. The rate constant of the…

Q: If a rock contained 12.0 g of ⁴⁰K when the earth was formed 4.54 billion years ago and the half-life…

A: Given information is as follows; Initial mass of ⁴⁰K in the rock A0 = 12.0 g Final mass of ⁴⁰K in…

Q: Moonrock collected by a US Apollo mission is estimated to be 4.30 billion years old by uranium/ lead…

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Q: After 20 years, only 3.125% of the initial amount of radioactive isotope is left. What is the…

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Q: half-life of this isotope?

A: The half –life of Bismuth-218 isotope

Q: An ancient skull has a carbon-14 decay rate of 0.85 disintegration per minute per gram of carbon…

A: It's a nuclear decay reaction. Therefore, it will follow first order kinetics. And since it is…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A: Since this is a first order decay The rate constant with half life is given by…

Q: A radioactive isotope has a half life of 17.4 minutes. How long will it take for the radiation from…

A: Half life is a time taken to half the concentration of the substance present. here , the radioactive…

Q: Explain what is meant by the binding energy of an isotope

A: Isotopes are two or more atoms that have the same atomic number but different mass numbers. The…

Q: Carbon-14 has a half-life of 5730  years . In a plant fossil, you find that the  14C  has decayed to…

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Q: Radium-226 (atomic mass = 226.025402 amu) decays to radon-224 (a radioactive gas) with a half-life…

A: First, decay constant value is determined using given half life value.

Q: The Cs-131 nuclide has a half-life of 30 years. After 120 years, 3.0 g remain. What is the original…

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Q: Iodine-131 has half life of 9 days meaning that after every 9 days the amount of isotope is reduced…

A: The half-life of Iodine-131 is 9 days. Initial amount =10.0 g  Time = 18 days. 18 days means => 9…

Q: 100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will…

A: Radioactive decay follows first order kinetics. Given that half life is 36 hours. So the rate…

Q: The radioactive nuclide 9Co has a half-life of 5.27 years. Calculate the mass of 2Co that remains…

A: We have to calculate the amount remaining after 1 year.

Q: Iodine-131 has a half-life of 8.04 days. If you begin with 2.7 mg of radioactive "I what mass…

A: Half-Life: The half-life of a radio active material will tell us the time it takes for one-half of…

Q: A 4.0 g sample of Ra-226 decays to 1.0 g. If the half-life of Ra-226 is 1620 years, how much time…

A: Given initial concentration of Ra-226 = [Ra-226]0 = 4.0 g  Final concentration = [Ra-226] = 1.0 g…

Q: The half-life of tritium is 12.32 yrs. If 49.1 mg of tritium remains of a sample with an initial…

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

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Q: How much of a 24- gram sample of Radium -226 will remain unchanged at the end of three half- life…

A: Radium-226 is a radioactive element. Here 24 g of the radium sample undergoes radioactive decay. The…

Q: The half-life of tritium is 12.32 yrs.If 49.1 mg of tritium remains of a sample with an initial mass…

A: The question is based on the concept of chemical kinetics. we have to calculate how much time has…

Q: An 80 g sample of radioisotope decayed to 10 g after 24 days. What was the total number of grams of…

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Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A: Calculate the value of rate constant (k):

Q: 1. If the amount of the parent isotope in the original sample of a rock had been 48 grams, about how…

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Q: If the half-life of a radioactive isotope is 32 days, how many half-lives must pass before a 3.0…

A: Radioactive decay follows the first-order kinetics. The half-life of the first-order reaction does…

Q: What is the binding energy per nucleon in 19/9 F (atomic mass, 18.9984 amu)?

A: Given information: Atomic mass of fluorine = 18.9984 amu First the theoretical mass of fluorine is…

Q: 1.50 moles of a radio nuclide emits 3.09 x 1010 beta particles per second. assumed that each beta…

A: Here 1.5 moles of radio active nuclide emits 3.09×10^10 beta particles per second. We have to…

Q: Plutonium-236 is an alpha emitter with a half-life of 2.86 years. How long will it take for the 1.20…

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Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.30 billion years old by…

A: Given: Age of rock = 4.30 billion years = 4.30 X 109 years Final mass of 238U remaining = 1.325 g…

Q: The cesium-131 nuclide has a half-life of 30 years. After 120 years, about 3 g remains. The original…

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Q: Radium-226 (atomic mass = 226.025402 amu) decays to radon-224 (a radioactive gas) with a half-life…

A:

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: Technetium-99 which has a half life of 6 hours is a useful isotope in diagnostic tests. If a patient…

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Q: A chemist wishing to do an experiment requiring 4' Cat (half-life = 4.5 days) needs 5.0 µg of the…

A: Given :  Half life (t1/2) = 4.5 days  Mass of 47Ca+2 required = 5.0 ug  Time for delivery = 96 hour…

Q: If a rock contained 12.0 g of 4°K when the earth was formed 4.54 billion years ago and the half-life…

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Q: 4. The half-life of radioactive radium-224 is 3.50 days. What was the original mass if 0.200 g…

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Q: 12. A year ago there were 4 grams of a radioactive substance. Now there are 3 grams. How much was…

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Q: 3.7. The radioactive nuclide Co has a half-life of 5.27 years. Calculate the mass of Co that remains…

A: Rate of a reaction determines the speed with which a reaction proceeds. First order reaction is a…

Q: The radioactive isotope *Pa decays by beta emission. 234 If the mass of a sample of protactinium-234…

A: Initial mass of isotope M = 83.5 ug Final mass of isotope M' = 20.9 ug  Time of decay t = 13.5 hours…

Q: Technetium-99 which has a half life of 6 hours is a useful isotope in diagnostic tests. If a patient…

A:

Q: The 175Pt isotope has a half-life of 2.53 seconds. What percentage of the original quantity of 175Pt…

A: The radio active decay follows first order kinetics. The half life t1/2 and rate constant K of a…

Q: How long will it take a radioactive sample of iodine-131 (half-life 8.07 d) to lose

A: The spontaneous disintegration of alpha, beta and gamma radiations by a substance irrespective of…

Q: When will a 1.00 g sample of thorium–232 have a mass of 1.00 mg, knowing that the half – life of…

A:

Q: Strontium-90 has a half life of 28 years. If a 5.31 mg sample was stored for 112 years, what mass of…

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

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.10 billion years old by…

A: Concept:  Radioactive decay: It is the process by which an unstable atomic nucleus loses energy by…