You start with 654 milligrams of a specific radioactive isotope. The half life is 85 days. How many milligrams of this isotope remain after 340 days? Report to 3 significant figures.

Q: The half-lives of different radioisotopes are given in the table. Radioisotope Half-life (min)…

A: Given  Half life of Lead - 196     = 37 min  Initial Amount (A)0          =  64 mg Remaining Amount…

Q: The radioactive decay of a sample containing an unknown radioactive isotope produced 6274…

A: Given Initial disintegration = 6274 Final disintegration = 1898 Time = 15.31 days

Q: If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9% of the…

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Q: Radioactive calcium-47 decays with a half-life of table (calcium-47) days. A chemist obtains a fresh…

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Q: The half-life of the radioactive isotope astatine-218 is 2.00 seconds. How long will it take for the…

A: all radioactive reactions are first order.  Here first calculate the rate constant with the help of…

Q: Given 100.0 grams of a sample that has a half life of 7.02 days, determine the time in days for…

A: Such type of reaction follows 1st order kinetics. t=logAoAtlog2× t1/2

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: Substance D initially weights 56 grams. After 6 minutes, it was observed that its mass decreased by…

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Q: Sodium-24 has a half-life of 14.8 hours. How much of a 553.8 mg553.8 mg sodium-24 sample will remain…

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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: Use the References to access important values if needed for this question. Iron-59 is a radioisotope…

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Q: What is the half-life of the bizarre isotope Toddium - 419 (it is a makeup element) if after 4.00…

A: Time period, t = 4.00 weeks Initial amount, [A]o =950.0 g Final amount, [A] = 29.6875 g Calculation…

Q: The half-lives of different radioisotopes are given in the table. Half-life (min) Radioisotope…

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Q: 5. Carbon-11, used in medical imaging, has a half-life of 20.4 min. The carbon-11 nuclides are…

A: Answer: Relation between quantity of radioactive substance and n number of half lives is shown…

Q: The half-life time of an isotope of element X is 7.4 hours. Assuming that you start with 431 mg of…

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Q: The half-lives of different radioisotopes are given in the table. Half-life (min) 12 37 potassium-44…

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Q: A certain drug has a half-life in the body of 2.0 h. Suppose a patient takes one 200. mg pill at…

A: Half life of the drug = 2 h Amount of drug initially present = 200 mg+200 mg = 400 mg Time = 11 – 7…

Q: ou start with 2.00 moles of radioactive element with a half-life of 146 days. How many days until…

A: All decay reactions follow first-order kinetics.The initial number of moles of the element = 2.00…

Q: A certain drug has a half-life in the body of 1.0 h. Suppose a patient takes one 300. mg pill at…

A: Given that: The half-life of the drug = 1.0 hoursUnder the given conditions, we are required to…

Q: Technetium-99m, an important radionuclide in medicine, has a half-life of 6.0 hours. What percentage…

A: Half life of technetium - 99 is = 6 hours.  Let Take a sample of technetium - 99 having number of…

Q: 1. A sample of radioactive iodine-131 atoms has a half-life of about 8 days. Suppose that 1 000 000…

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Q: If a quantity decreases by a factor of 8 every 30 years, what is its half-life?

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Q: 1. A lab tech prepares 50.0 mg of I-123 on Tuesday, how many mg will remain 39 hours later if the…

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Q: The half life for Carbon-14 is 5730 years. Calculate the amount of time it would take 60.0 g of…

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Q: A dinosaur fossil sample has 30% of its original amount of carbon-14 present. Assuming that the…

A: The objective of the question is to calculate the age of the fossil.

Q: [Review Topics] [References] Use the References to access important values if needed for this…

A: Interpretation -  To determine the the age of the artifact , when a radioactive isotope carbon-14…

Q: Nitrogen-13 has a biologic half-life of 2.84 minutes and emits positrons.    If a patient is…

A: Initial concentration of nitrogen-13 = 500.0 micrograms  Half- life = 2.84 minutes  Half-life means…

Q: A solution of sodium iodine containing the radioactive isotope Iodine-131 was given to a patient. If…

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Q: If a sample has a half-life of 1 hour, how much of a 10.000 g sample would remain after 2 hours?

A: Any atomic nucleus which is mainly unstable tends to lose energy through radiation and this process…

Q: ou start with 925 grams of a specific radioactive isotope. The half life is 73 days. How many…

A: The radioactive decay follows first-order kinetics. The integrated rate law for the first-order…

Q: 1) What fraction of a sample of 32P will be left after 120 days? Its half-life is 14.3 days.…

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

A: Half life is defined as the time required for a substance to reduce to half of it's initial…

Q: Cobalt-60 is radioactive and has a half life of 5.26 years. What percentage of a sample would be…

A: For the reaction - A   +     B      →      C     +      D Rate = KAnBm where n and m are order of A…

Q: lodine-131 is a radionuclide that is frequently used in nuclear medicine. Among other things, it is…

A: Sample mass of Iodine - 131 initially = 0.16 gram Half life of iodine-131 = 8 days We know that…

Q: You start with 600.0 milligrams of radioactive element with a half-life of 85 days. How many days…

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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.