Chemistry An unknown radioactive substance has a half-life of 3.20 hourshours . If 34.7 gg of the substance is currently present, what mass A0A0 was present 8.00 hours ago? Express your answer with the appropriate units.

Q: Uranium-238, 238U, has a half-life of 4.51 x 109 years. How long will it take for 1.0 g of 238U to…

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Q: bromine-88 is radioactive and has a half life of 16.3 seconds. how long would it take a sample to…

A: Applying concept of radioactive decay as first order reaction.

Q: Be sure to answer all parts. The radioactive decay of thallium-206 to lead-206 has a half-life of…

A: Here we have to calculate number of atom left after 42 minutes-

Q: The half-life of strontium-90 is 28 years. How long will it take a 30-mg sample to decay to a mass…

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Q: The isotope 208 Tl undergoes Beta- decay with a half-life of 3.1 minutes. Calculate the amount…

A: Given, T208I undergoes beta decay. T1/2= 3.1 min initial concentration , CA0= 41.4 g time , t =…

Q: The half-life of a radioactive element is 1,250 years.What percent of the atoms remain after 5,000…

A: Number of half lives = 50001250 = 4 100%  →1250 years 50%  →1250 years 25% →1250 years 12.5 % →1250…

Q: Cobalt-60 has a half-life of 5.27 years and is used in cancer treatment. If a patient ingests 20.0 g…

A: Since the decay reactions are first order reactions hence the relationship between the time and mass…

Q: Strontium-90 is present in the fallout produced by nuclear weapons testing in the atmosphere. Sr-90…

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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: Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 7.20 mg sample would be…

A: The solution is as follows :

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

A: All radioactive decay processes follows first order kinetics. Half life t12 is the time taken to…

Q: A certain drug has a half-life in the body of 3.0 h. Suppose a patient takes one 250. mg pill at…

A: Given , mass of pill = 250 mg half life of drug = 3.0 h

Q: A scientist obtains 64 grams of a radioactive isotope.  The isotope has a half-life of 3.2 days.…

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Q: One of the radioactive isotopes used in chemical and medical research is sulfur-35, which has a…

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Q: A scientist puts 250 grams of radioactive radium having a half life of 1690 years into a concrete…

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Q: Iodine-131 is radioactive and has a half life of 8.04 days. How much of a 8.90mg sample would be…

A: Half life tells you about the intervals when your initial sample will get halved.

Q: Americium-241 is widely used in smoke detectors. The radiation released by this element ionizes…

A: Given,  Mass of Am-241 = 5.00 g.  Half life of Am-241 = 433 years.  Here, we have to calculate…

Q: 40. Tc-99 is often used as a radioactive tracer in several medical diagnostic procedures. It has…

A: (a) Interpretation: The amount of Tc-99 that will remain in the patients body after 24 hours is to…

Q: Radioactive Radon-222 gas (222Rn) occurs naturally as a product of uranium decay. The half-life of…

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Q: A 169 ng sample of radioactive material has a half life of 3.9 days. How many ng of radioactive…

A: Sample of redioactive material=169ng Half life=3.9days

Q: Cesium-137 is radioactive and has a half life of 30. years. How much of a 8.10 mg sample would be…

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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: Lead-211 is a radioactive isotope with a half life of 36.1 minutes.  How long will it take for only…

A: Chemical kinetics is branch of chemistry that deals with rates of chemical reactions.

Q: Cesium-137 is radioactive and has a half life of 30. years. How much of a 1.70 mg sample would be…

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Q: Carbon-14 is used for archaeological carbon dating. Its half-life is 5,730 years. How many grams of…

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Q: Strontium-85, used for bone scans, has a half-life of 65 days. How long will it take for the…

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Q: Indium-116 is radioactive and has a half life of 14.10 seconds. How long would it take a sample to…

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Q: Phosphorus- 32 is radioactive and has a half life of 14.3 days. How much of a 2.70mg sample…

A: The rate constant for the reaction, k, is calculated as shown below where t1/2 is the half-life for…

Q: avier is at NASA analyzing Moon rocks. In one of the rocks from the lunar maria, he discovered 79 %…

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Q: Tin-129 is radioactive and has a half life of 2.23 minutes. What percentage of a sample would be…

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Q: Iodine-125 is a radioactive isotope commonly used in medicine. It has a half-life of 59.5 days.…

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Q: One of the radioactive isotopes used in chemical and medical research is iodine- 125, which has a…

A: Given -  Half life of iodine = 61 days  Initial concentration of iodine (No) - 1 g After time t…

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.