After 4.00 years a 2.0 g sample of a radioisotope remains from a sample that had an original mass of 4.00 g. Calculate the half life of this mysterious substance. How much of the radioisotope remains after 20 years?

Q: The half life for the decay of carbon-14 is 5.73 × 10’ years. Suppose the activity due to the…

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Q: 1. A substance has a mass of 5 grams after decaying for 100 minutes. What was the mass of the…

A: Given that: Mass of substance left after decaying = 5 g Total time for decaying of substance = 100…

Q: Beginning with 1.00 g of a sample of an unknown radioactive isotope, 0.05674 g of the isotope will…

A: The answer to the following question is-

Q: A sample of polonium-210 has a half-life of 138 days a)What fraction of polonium-210 remains after…

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Q: 52. Estimating the Date That a Prehistoric Man Died The bones of a prehistoric man found in the…

A: Radioactive disintegration follows the first-order kinetics, i.e., the rate of the reaction depends…

Q: A piece of literature has announced that Uranium 238( 23822U) has a binding energy of approximately…

A: We can theoretically calculate the mass of a neutron. But this will be different from the…

Q: A shell fossil that originally contained 100 mg of carbon-14 non contains 75 mg of the isotope.…

A: Initial amount, [A]0 = 100 mg  Final amount, [A] = 75 mg  Half-life, t1/2 = 5570 years

Q: A radioactive isotope has a half-life of 11 minutes.  How many grams of a 18.68 g sample remain…

A: Given Half life = 11minutes = 11*60= 660 second Sample weight = 18.68g Time = 44 minutes = 44*60=…

Q: Plutonium – 236 is an alpha emitter with a half-life of 2.86 years. If a sample initially contains…

A: Given data Half life : t1/2=2.86 year Initial amount : No=2.56 mg time : t=7 year…

Q: The half life for the decay of carbon-14 is 5.73 × 10° years. Suppose the activity due to the…

A: Given: Half-life of carbon-14 decay = 5730 years. Activity of carbon-14 in the sample = 51 Bq. And…

Q: Suppose that 10 units of beryllium are present in a living organism and that the half-life of…

A: Here i have calculated the age of material

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: A radioactive isotope decayed to 17/32 of its original mass after 60 minutes. Find the half-life of…

A: All radioactive decays follows first order kinetics . The integrated rate equation for first order…

Q: You have a sample of Bismuth-212 to prepare for an upcoming medical test.  This isotope has a…

A: The radioactivity follows first-order kinetics. The half-life relates to the rate constant, k for…

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 wooden statue found in Egypt has a carbon-14 content that is three-fifths of that found in living…

A: Given: A wooden statue found in Egypt has a carbon-14 content that is three-fifths of that found in…

Q: If 7.0 grams of a sample decays to 0.44 grams in 2.0 hours, what is the half-life time of the…

A: For calculation of half life first of all we need rate constant of the reaction, which can be…

Q: How long will it take for a 40.0-gram sample of Iodine-131 to decay to 1/16th of its original mass?…

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Q: An unknown radioactive substance has a half-life of 3.20 hours. If  20.8 g of the substance is…

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Q: A fossilized bone is found to contain 1/1000 the original amount of C – 14. Determine the age of the…

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Q: The half life for the decay of carbon-14 is 5.73 × 10 years. Suppose the activity due to the…

A: Given that : Half-life of carbon-14 = 5.73 x 103 years The activity due to the radioactive decay =…

Q: The half life for the decay of carbon-14 is 5.73 x 10 years. Suppose the activity due to the…

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Q: c) What percentage of the isotope will remain after 115 days lfur 25. alpha beta and

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Q: At a certain instant, 100 grams of radioactive substance is present. After 20 years, 99.76 grams…

A: The half-life is the time required to change the initial amount to half of the amount. It is denoted…

Q: Suppose a certain radioactive substance has a half-life of 2 years. Find how long it will take for…

A: Half life is the time of the reaction in which the reaction is 50% completed. Write the expression…

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: 8. A radioisotope is going to be used in an experiment. At the end of 10 days, only 5% is to be…

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Q: After 19 days have elapsed, 1/21 of a radioisotope sample remains undecayed. What is the half-life…

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Q: A 50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured…

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Q: . If the half-life of a radioisotope is 3

A: Half life (t1/2 or t50%) :  The time required to consume half of the initial reactant is called "…

Q: A 50.0g sample of nitrogen-16 takes 14.4 second to decay to a mass of 12.5G. Calculate the half life…

A: Given: The time taken by N-16 to undergo decay, t = 14.4 sec The initial amount of N-16, No = 50.0 g…

Q: If a rock sample was found to contain 4.30 x 10-7 mol of argon-40, how much potassium-40 would also…

A: Nuclear disintegration follows first order kinetics  λ=2.303 log(A0/A)/t  λ=0.693/t1/2 or 0.693/t1/2…

Q: unknown sample contains radioactive element U-235. If the original amount present is 3500 atoms, how…

A: Given- Number of initial atom =3500 atoms Number of final atom =125 atoms  Half life =700 million…

Q: The half life for the decay of carbon-14 is 5.73 × 10° years. Suppose the activity due to the…

A: Given: Half-life of carbon-14 decay = 5730 years. Activity of carbon-14 in the sample = 90 Bq. And…

Q: If you have 2.00 grams of a radioisotope, with a half-life of 5 days, how much of the isotope is…

A: Given;

Q: How much of a 0.15 g sample of U-238 after the passage of 3200 years? Half-life is 4.01x10^9 years.

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Q: The half-life of a given radioactive substance is 2.5 minutes. What fraction of the original…

A: Given, half-life , t1/2 = 2.5 min                     and, t = 10 min We need to calculate the…

Q: After 103 days, only 2.3 g of a radioisotope remains from a sample that originally has 150 g of it.…

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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: 1. A sample of einsteinium-252 decayed to 64.3% of its original mass after 300 days. a) What is the…

A: The rate law for the 1st order reaction is given by, k=1tln[A]0[A] where k is the rate constant, t…

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: 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: 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 25-g sample of a pure radioisotope decayed until approximately 1 gram remains. If it took 245 days…

A: Given, A 25-g sample of a pure radioisotope decayed until approximately 1 gram remains. If it took…

Q: Hydrogen-3 is radioactive and has a half life of 12.3 years. How long would it take a sample to…

A: Given that -  Hydrogen-3 is tritium which is a radioactive isotope with half life = 12.3 years…

Q: What is the approximate age of the artifact?

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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…