The half-life of phosphorus-33 is 25 days. How much of a 128-g sample will remain after 150 days?

Q: the half life of oxygen-15 is 2 minutes. what fraction of a sample of O-15 will remain after 5…

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

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Q: The first-order decay of radon has a half-life of 3.823 days.  How many grams of radon remain after…

A: Ans

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: The half-life of cobalt is 5.3 years. How much of a 1.000- mg sample of cobalt-60 is left after 15.9…

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Q: The half-life of strontium-87 is 2.8 h. What percentage of this isotope will remain after 8 h and 24…

A: Radioactive decay is the breaking of unstable nuclei into stable ones by emitting radiation. These…

Q: 137 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

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Q: Cesium – 137 has a half life of 30 years. How much of a 100 mg sample is left after 120 years?

A: A numerical problem based on half-life period, which is to be accomplished.

Q: If a tree dies and the trunk remains undisturbed for 1.210 × 10⁴ years, what percentage of the…

A: given data is  half-life is 5730 years remains undisturbed for 1.210 x 104 years

Q: Iodine-131 has a half life of 2.2 × 10-2 year. How long will it take to reduce a 133 g sample of…

A: Half Life = t1/2 = 2.2 * 10-2 yeark t1/2 = ln (2)k * 2.2 * 10-2 year = 0.693k = 31.5 year-1

Q: If we start with 1.000 g of strontium-90, 0.953 g will remain after 2.00 yr. (a) What is the…

A: Integrated rate equation for radioactive decay: k = 2.303tlog1.0000.953 k  = 2.3032.00 yr×0.0209  k…

Q: What is the half-life of an element that begins with 100g, and 18.8g remains after 113 minutes.

A: Half life of radioactive element-is the time needed for given number of its nuclei to decay exactly…

Q: Calculate the mass of sodium-24 that will remain in a 20.0 g sample after 75 hours. Sodium has a…

A: Chemical kinetics is branch of chemistry in which we deal with the speed at which rate of reaction…

Q: The half-life of selenium-83 is 22.3 min. If a sample contains 24.0g of selenium-83, how long will…

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Q: The half-life of potassium K-42 is 14.5 hours. (a) how much of 11g sample is remaining after 5…

A: During radioactive decay, the decaying speed shows linear relation with initial mass of atom. This…

Q: The half-life of P-33 is 25.3 days. How long will it take for 64 g of P-33 to deplete to 1.0 g? A.…

A: Given, Half life = 25.3days

Q: The half-life of mercury-203 is 46.6 days. What percentage of mercury-203 remains in a sample after…

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Q: The half-life of 123I is 13 hr.  How much of a  64 mg sample of 123I is left after 26 hours?

A: The isotope of iodine, 123I, undergoes decay in accordance with first order kinetics. The half-life…

Q: A rock contains 0.257 mg of lead-206 for every milligram of uranium-238. The half-life for the decay…

A: The first-order rate law can be transformed into another highly useful equation with the decay…

Q: How many grams will be left after 100 days if you have 150 g of thorium-234 at the beginning?…

A: Given,  The mass in grams will be left after 100 days of the decay, if initial amount of Th-234 is…

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: The half-life of Radium-226 is 8 years. How much of an initial 171 g sample will remain after 43…

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Q: If we start with 1.000 g of strontium-90, 0.953 g will remain after 2.00 yr. (a) What is the…

A: As we know, that Radio active decay follows first order kinetics. Rate constant for first order…

Q: The half-life of iron-59 is 44.5 days. How much of a 3.00-mg sample will remain after 222.5 days?

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Q: It takes 870.98 years for carbon-14 to decay to 90 mg. What is the half life of carbon-14?

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Q: If a tree dies and the trunk remains undisturbed for 1.305 × 104 years, what percentage of the…

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Q: The half-life of cobalt-60 is 5.27 yr. How much of a 1.000-mg sample of cobalt-60 is left after…

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Q: What is the half-life of iron-55 if 5.93 years are required for the activity of a sample of iron-55…

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Q: A radioactive sample initially contains 2.40×10^−2 mol of a radioactive material whose half-life is…

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Q: The half-life of Oxygen-15 is 2 min. What fraction of a sample of O-15 will remain after 5 half…

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Q: The half life of 123I is 13 hr.  How much of a 64 mg sample of 123I is left after 26 hours?

A: Given,Half life of 123I is 13 hr

Q: The half-life of radium 226 is 1602 years. If you have 500 grams of radium today how many grams…

A: This is a first order reaction where the radioactive substance disintegrates. The half life time of…

Q: The​ half-life of​ silicon-32 is 710 years. If 20 grams is present​ now, how much will be present…

A: Radioactive decay is always a first order reaction. The rate equation for the radioactive decay is :…

Q: If a tree dies and the trunk remains undisturbed for 1.775 × 10⁴ years, what percentage of the…

A: Given-> Half life = 5730 year  Time = 1.775 × 104 year.

Q: The half life of the radioactive element ubtonium-31 is 10 seconds. If 80 grams of unobtanium-31 are…

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Q: PET scans require fluorine-18, wich is produced in a cyclotron and decays with a half-life of 1.83…

A: Given data,Half life(t1/2)=1.83hoursSpeed=60.0miles/hrLet initial concentration of F-18 be 100Final…

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: If a tree dies and the trunk remains undisturbed for 1.195 × 10⁴ years, what percentage of the…

A: Carbon dating is a technique to estimate the age of the tree or rock

Q: The half-life of Radium-226 is 13 years. How much of an initial 179 g sample will remain after 36…

A: Radio active reactions are first order reactions. Decay constant (k) = 0.693 / t1/2 Where, t1/2 =…

Q: The half-life of Oxygen-15 is 2 minutes. What fraction of a sample of O-15 will remain after 5 half…

A: Given,half-life = 2 minutesNeed to find out the fraction remaining after five half-lives.

Q: If 25%(1/4)of a radioactive element remains after1,000years, what is the half-life?

A: Radioactive elements are those elements whose nuclei are highly unstable and hence undergo…

Q: How many hours are needed for a 16.0 g sample of Si-31 to decay to 2.0 g? The half-life for Si-31 is…

A: Solution -

Q: If a tree dies and the trunk remains undisturbed for 1.635 × 10⁴ years, what percentage of the…

A: Given, time t = 1.6 x 104 years , half life t1/2 = 5730 years

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: 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: Radium has a half-life of 1600 years. How many years does it take for 90% of a given amount of…

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Q: The half life of radium-226, the first radioactive element discovered, is 1,620 years. If a sample…

A: Radioactive reactions are of first order. The relationship between half life t1/2 and rate constant…

Q: The half-life of Strontium-85 is 65 days. How much of a 80. mg sample is left after 260 days? mg

A: Given: Initial mass of sample = 80 mg  Time passed = 260 days. And the half-life of isotope = 65…

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.

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.