An organism had 665 grams of Carbon-14 (a radioactive form of carbon) in it when it died. How much remains after 5 half lives?

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: A Radioactive substance decays exponentially. A scientist begins with 250 milligrams of a…

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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: Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr.    If you start with 2.44 g of…

A: Interpretation: The amount of beta particles are emitted in 125 days is to be calculated from the…

Q: Cobalt-60, used in cancer therapy, decays by beta and gamma emission. The decay constant is 4.18 x…

A: Half-life is the interval of time required for one-half of the atomic nuclei of a radioactive sample…

Q: A sample of a radioactive metal starts with a mass of 400 grams. When a chemist examines it later,…

A: 25 g of metal remains after 4 half-lives.

Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

A: The spontaneous breakdown of the nucleus causes the release of energy and matter from the nucleus,…

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: In the radioactive decay of Uranium- 238 into Thorium-234, which of the following radioactive…

A: The radioactive decay is the process of conversion of one atomic nucleus into another by the…

Q: A sample contains 4 grams of carbon (half life 5730 years). How much carbon will remain after 1500…

A: The mass of the sample is = 4 gram The half-life of carbon is = 5730 years The amount of the sample…

Q: The radioisotope radon-222 has a Half-Life of 3.8 days. How much of a 73.9-g sample of radon-222…

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Q: when it died. How much remains after 5 half lives

A: As we know, Radioactivity follows first order kinetics. So, after nth half life time , amount(A)…

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: Radioactive iodine (Iodine-131) has a half-life of 8.04 days. How long will it take for 150g of…

A: Given: The half-life of Iodine-131, t12 = 8.04 days. The initial amount of Iodine-131, (N0) = 150 g.…

Q: Sodium24, which is used to locate blood clots in the human circulatory system, has a halflife of…

A: Consider the given information is as follows; Order of the reaction = 1 (as radioactive decay)…

Q: A substance has gone through 3 half lives. What percentage of the sample would remain?

A: Remaining % of sample can be calculated by      =     Original sample/ 2n assume original sample =…

Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

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Q: Chemists working to develop substances for filtering greenhouse gases from the atmosphere have…

A: The decay differential equation is given as, dAdt = -kAA: Concentration at any time tK: Decay…

Q: Radioisotope X has a half-life of 4.0 h. Based on the figure below, if the original sample of the…

A: Given,(i) initial amount of radio isotope X = 16.00 gHalf-life = 4.0 hTime taken for decay = 12.0…

Q: The radioactive substance neptunium -139 decays to 72.85% of its original amount after 28 hours. How…

A: For radioactive decay, relation between rate constant and its concentration is give below.…

Q: An organism had 170 grams of Carbon - 14 (a radioactive form of carbon) in it when it died. How much…

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Q: If 20% of the radioactive substance disappears in one year, find its half-life assuming exponential…

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Q: 12) How much material is left when you start with 15-g and you have gone through 1.63 half-lives?

A: Radioactive decay happens when a nucleus is subjected to radiation and breaks down into a number of…

Q: The concentration of carbon-14 in living plants is about 240 Bq/kg C. If a tree dies today, what…

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Q: The radioactive isotope Pu-238, used in pacemakers, has a half-life of 87.7 years. If 1.6 milligrams…

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Q: Cobalt-60, used in cancer therapy, decays by beta and gamma emission. The decay constant is 4.18 x…

A: Expression for half-life period of radioactive element is given as, t1/2=ln2λλ-Radio active decay…

Q: How much time is required for 84% of the isotope to decay?

A: Given: Iodine-131, which is used to treat thyroid cancer, has a half-life of 8.04 days. The…

Q: Strontium-90, a beta emitter, has a half-life of 28.1 years. a. Write the balanced nuclear equation…

A: Beta decay of any nuclide brings about the changes in the atomic number whereas the mass number…

Q: Chromium-51 nuclide is used in studies to evaluate the lifespan of red blood cells and bone marrow…

A: Chromium-51 is a commonly used radionuclide with a half-life of 27.7 days, emitting gamma rays with…

Q: Cobalt-60 has a half-life of 5.27 years.  Considering a piece of that radioactive material, which…

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Q: The radioactive isotope Pu-238, used in pacemakers, has a half-life of 87.7 years. If 1.9 milligrams…

A: Given : Half - life = 87.7 years Initial Pu-238 = 1.9 mg

Q: If you started with only 20 grams of phosphorus-32, about how much would remain after 42.9 days…

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Q: A radioactive sample has a mass of 500 grams. How much remains after two half-lives?

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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: Cobalt-58 which is radioactive, has a half-life of 71 days. How

A: Radioactivity follows first order kinetics Hence decay constant (K) and t1/2 (half life ) related as…

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.