Element X has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using Element X, how much Element X will be left when the experiment begins?

Q: The half life of an isotope is 43 seconds.  How long does it take 100.00 g of that isotope to decay…

A: Given that  Initially weight of isotope sample = 100.0 gm initially number of atoms of isotope No=…

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: 9. Suppose the amount of a certain radioactive substance in a sample decays from 3.80 mg to 1.70 mg…

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

Q: The half-life of element X is 500 years. If there are initially 8 g of X, how much will remain after…

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Q: a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an initial sample of 33 grams,…

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

Q: a certain radioactive substance decays at a rate proportional to the amount present. If a quarter of…

A: quarter of a radioactive substance decayed after 35 hours

Q: . Barium – 122 has a half-life of 2 minutes. Suppose you obtain a sample weighing 10.0 g and it…

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Q: The isotope nickel-63 has a half-life of 100 years. If a tested sample has five grams of nickel-63…

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Q: (6) After three half-lives, 100% (A) (B) 50% (C) 25% (D) 12.5% % of the initial isotope of a…

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Q: Barium -122 has a half life of 2 minutes. Suppose you obtain a sample weighing 10.0g and it takes 10…

A: Since the decay reactions are first order reactions. Hence the half life of reaction will remain…

Q: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life?

A: Given is the radioactive isotope.We know any radioactive decay follows first order  reaction…

Q: Element X has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10…

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Q: 1. A 1 kg mass of radioactive material was left to decay in a laboratory. After 12 years, the…

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Q: The initial amount of the radioactive material V in a rock is determined to be 6.78 mg. Only 1.46 mg…

A: final answer is = 5.3200 mg

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: The half-life of element X is 20 days. How much of an 80 g sample remains after 80 days?

A: Given :  Half life of element = 20 days  Initial amount of sample = 80 g  To calculate :  Amount of…

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: 7. If uranium-238 has a half-life of 45 billion years, how many years would it take for a 10-gram…

A: The half-life is the time required to reduce one half of the initial concentration of the substance.

Q: (19] There are 40 grams of radioactive substance at one point in time. After two hours, only 30…

A: The half-life of a quantity is the amount of time it takes to decrease to half of its original…

Q: Cesium-134 is a β emitter with a half-life of 2.0 years. How much of a 2.50-g sample of cesium-134…

A: The radioactivity decay follows the first order kinetics. The formula for the first order kinetics…

Q: 1.Element F has a quarter life of 10 hrs. If there are 925 milligrams remaining of element F after…

A: SOLUTION: A = AoE-KT  (First order reaction) Quarter life = 10Hours At quarter life A=3Ao/4 3Ao/4 =…

Q: The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of…

A: Given, Half Life t1/2 = 800 years. A = 12.5%  Ao = 100 %  Time , t = ?

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: The half-life time of a radioactive element is 6.0 days. A sample of 50.0 g of this element is…

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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: Suppose the amount of a certain radioactive substance in a sample decays from 7.10 mg to 5.20 mg…

A: Radioactive decays are first order reactions. Since we know that the relationship between the amount…

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: Suppose the amount of a certain radioactive substance in a sample decays from 6.50 mg to 2.40 mg…

A: Radioactive decay is a first-order reaction. On applying the value for rate constant k, we find it…

Q: The half-life of Palladium-100 is 4 days. After 24 days a sample of Palladium-100 has been reduced…

A: N  = N0 e-λt  N0  = Initial mass of the sample N = Mass of the sample after a time 't' λ = decay…

Q: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life? a) 20…

A: The radioactive decay is an example of first order reaction.

Q: A radioactive material decays at a rate proportional to its amount. If the material has a half-life…

A: To solve this question, first find out rate constant using half life and then use that to find out…

Q: At a given time, there are 1.2 mg of a radioactive substance present. After 6 hours there is only…

A: To solve this question, first find out the rate constant of radioactive substance and using that…

Q: The half-life of Palladium-100 is 4 days. After 12 days a sample of Palladium-100 has been reduced…

A: The initial mass of the sample of palladium-100, No, in mg is calculated as shown below where t1/2…

Q: A rock is analyzed in the laboratory for radiometric dating and found to contain 1/8 parent atoms…

A: Any process that occurs by radioactive decay follows first-order kinetics. The equation used to…

Q: Substance Q initially weights 120% of its remaining mass after its decay in 60 minutes. What is its…

A: Given  substance Q initial weight =120% of its remaining mass after its decay for 60 mins t=60…

Q: Barium -122 has a half-life of 2 minutes.  Suppose you obtain a sample weighing 10.0g and it takes…

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Q: Iodine-131 has a half-life of 8.0 minutes. How many half-lives will pass in 120 minutes?

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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: The half-life of Palladium-100 is 4 days. After 20 days a sample of Palladium-100 has been reduced…

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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: . If Gallium-68 has a half-life of 1.13 hours, how much of a 10.0 mg sample is left after 5.69…

A: 1.  given :-  initial amount of sample = 10.0 mg  half life of Gallium-68 (t1/2) = 1.13 hours  To…

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: The half-life of Palladium-100 is 4 davs. After 20 days a sample of Palladium-100 has been reduced…

A: The nuclear reactions of the radioactive elements are generally the first-order reactions. The…

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: A certain radioisotope has a half-life of 9.54 days. What percentage of an initial sample of this…

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Q: Calcium – 47 has a half-life of 4.5 years . How long will it take a 100 mg sample to drop to 12.5…

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Q: A 371.9 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

A: On passing a half life the concentration of the substance becomes half. Let the substance has passed…

Q: 5. Strontium-90 has a half life of 28.8 years. If you start with a 10 gram sample of Strontium-90,…

A: We have to predict the amount after 115.2 years.