U-235 has a half-life of 713 million years and the age of the sample is 2.631 years old then how many lifes has this sample undergone (Answer to 2 places)?

Q: If the amount of a radioactive element decreases from 0.36 g to 90. mg in 22 min, what is its…

A: Half-life (t1/2) is defined as the time required by a substance to reduce to half of its initial…

Q: Carbon-14 has a half-life of 5730 yr. A living organism has an activity of 15.2 counts per minute…

A: The solution is as follows :

Q: A radioactive sample contains 1.55 g of an isotope with a halflife of 3.8 days. What mass of the…

A: Given details, t1/2 = 3.8 days t = 5.5 days m0 = 1.55 g To calculate the mass of the isotope. By…

Q: If the half-life of 100.0 grams of a radioactive isotope is 8 years, how many grams will remain in…

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Q: The radioactive element carbon-14 has a half-life of 5750 years. A scientist determined that the…

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Q: You are studying a sample of granite that is about 2.1 billion years old. You know it contains some…

A: Here granite containing uranium -235 is formed 2.1 billion years old. We have to determine the…

Q: 210Rn has a half-life of 2.4 hours. You have a sample that contains 24 g of 210Rn. How much 210Rn…

A: The relationship between the half-life, T1/2 and the decay constant is given by  or,  The…

Q: Bi-191 has a half-life of only about 12 seconds. A large radioactive sample contains only 4.1 x 109…

A: Half life of Bi-191 = 12 sNumber of atoms of Bi-191 = 4.1 × 109 atomsNumber of moles of Bi-191 = ?…

Q: a 45.91 mg sample of a pure radioisotope has a half-life of 52 days, what will be the mass of the…

A: Given 45.91 mg sample of a pure radioisotope has a half-life of 52 day mass of the original…

Q: A radioactive isotope has a half-life of 12.0 seconds. How much of a 100 gram sample is left after…

A: Given  Initial Mass of Sample ( A)0  = 100 gram  Half life time ( t1/2)   = 12 sec  Time ( t ) = 36…

Q: e uranium decay series from U-238 to stable lead (Pb-206) is: U → 234Th → 234Pa → 234U → 230 Th →…

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Q: A sample of Uranium-234 has been decomposing. If the original mass of 234U is 2.57milligrams, how…

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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: In a sample of a radioactive isotope, 20.0 % has decayed after 16.0 days. Calculate the half-life of…

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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: A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at…

A: GIVEN:  To Find: Solution: As we know, For First order decay

Q: half-life of 4.536 days

A: Given data are as follows: Calcium-47 half-life = 4.536 days Initial weight of Calcium-47 = 250g

Q: 2. Gold-198 has a half- life of 269 days. What is the activity (in curies) o a 0.43 mg sample?

A: Activity is depends on the number of atom present

Q: A laboratory investigation shows that a sample of uranium ore contains 5.37 mg of 238/92 U and 2.52…

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Q: After 40.0 days, how much Ac-225 remains if the starting mass was 94.0 g? Ac-225 has a half life of…

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Q: A sample from an archeological artifact contained 7.97 x 10-11 g of C-14. A similar sample from a…

A: The objective of the question is to determine the number of half-lives that have passed and the age…

Q: Radium-226 (atomic mass - 226.03), the only naturally occurring isotope of this element, follows the…

A: Since the half-life of the 2nd and 3rd decay are very small in comparison to the 1st one, the 2nd…

Q: One of the many nuclear fission reactions 235U can undergo is:23592U+10n→8934Rb+14458Ce+310nThe…

A: Total mass of the reactants = 236.0526 amutotal mass of the products = 235.8765 amuSo, mass…

Q: Suppose the amount of a certain radioactive substance in a sample decays from 5.30mg to 1.40mg over…

A: The half-life of a radioactive substance is the time it takes for half of the atoms in a sample to…

Q: A laboratory investigation shows that a sample of uranium ore contains 8.11 mg of U (molar mass…

A: Given data: Mass of U-238 = 8.11 mg Mass of Pb-206 = 2.33 mg Half-life of U-238 = 4.5 x 109 years…

Q: Carbon-14 dating is used to find the age of ancient objects. The half-life of Carbon-14 is 5730…

A: Given : Half life of Carbon-14 = 5730 years  And the piece of clay pot has undergone 1.5 half lives.…

Q: In a 3 X 109 -year-old rock that originally contained some 238U , which has a half-life of 4.5 X 109…

A: Half-life is defined as the time in which the original numbers of nuclei are decayed to half. In the…

Q: The half-life of a radioactive sample is 60.0 y. If the sample weighs 0.893 g initially, how much…

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Q: Iodine-131 is a radioactive isotope. After 5.00 days, 65.0% of a sample of 131 I remains. What is…

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Q: Carbon-14 has a half-life of 5715 years. It is used to determine the age of ancient objects. If a…

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Q: If the half-life of 1-131 is 5.2 days, how many days would it take for only 3.2 x 10-2 grams of…

A: The half-life of a radioactive substance is the time it takes for half of the atoms in a sample to…

Q: Carbon-14 (14C) is a naturally occurring radionuclide of carbon with about 5,730 years half-life. If…

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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…