How long will it take for 1.800 mg of promethium-144 to decay to 0.1125 mg? The half-life is 17.5 min. of promethium-144

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 strontium-90 is 28 years. H

A: Given t1/2 of a reaction is 28 years  decay constant  (λ) λ = 0.693t1/2     = 0.69328 y     =…

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: Radium-223 decays with a half-life of 11.4 days.   How long will it take for a 0.240-molmol sample…

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Q: An old piece of wood has a carbon-14 content of 0.0156 times that 14 is the age of the old wood if…

A: We will use first order kinetics formula

Q: The half-life of Pxygen-15 is 2 minutes. What fraction of the sample will remain after 10 minutes…

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Q: 7. What is the half-life of an unknown substance if it is observed to decay from 15 mg to 3.75 mg in…

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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: The half-life for gallium-67, a radioisotope, is 78.25 hours. How much of a 56.7 sample of…

A: Given datas ;  t1/2 = 78.25 hrs. [A]0 = 56.7 mg  [A]t = ?  t = 359 hrs.  t/t1/2   = 359 hrs / 78.25…

Q: How old in years is a bottle of a solution if the deuterium 2H content is 67% that of a new wine?…

A: Intial amount of deuterium = 100  Final amount of deuterium = 67  Half-life of deuterium = 1 century…

Q: The half-life of 42K is 12.5 h. How much will remain after 101 h if the original sample contained…

A: Given: The half-life of 42K = 12.5 h. Initial amount of sample =256 g Time =101 h To determine:…

Q: a rock conatains 0.257mg of Pb-206 for every milligram of U-238. The half-life for the decay of…

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Q: Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a…

A: The objective of the question is to calculate the amount of Americium-241 consumed in a smoke…

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: The half-life of sodium-24 is 15 hr. If a sample initially contains 40. g of sodium-24, how much…

A: Radioactive reactions are First order reactions. Half life of Sodium-24 is 15 hr. Initial…

Q: The decay constant for the element X is 6.931 yr⁻¹. What is the half-life?

A: Relation between decay constant (K) and half life (t12) of an element:-t12 =0.693K

Q: Give typed solution only The half-life of Ruthenium -97 is approximately three days. If a 450 g…

A: To find out the mass of sample remaining, we need to find decay constant first. Using that decay…

Q: The half life of a radioactive iodine is 8 days. How long will it take for 0.25 g of radioactive…

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Q: Iron-59 is used to study iron metabolism in the spleen. Its half-life is 44 days. How many days…

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Q: The half-life of 87Sr is 2.80 h. Calculate how much time it would take for an isolated quantity of…

A: Time required to decay for a radioactive molecule,t = 2.303Klogaa-x Where a is the initial amount…

Q: The isotope 166-Yb decays by electron capture with a half-life of 57 hrs. What percentage of the…

A: We have to calculate the percentage of isotope left

Q: If a tree dies and the trunk remains undisturbed for 1.375 × 10⁴ years, what percentage of the…

A: Radioactive decay follows first-order kinetics. The half-life of the first-order reaction does not…

Q: The natural abundance of 14C in the earth's atmosphere and all living organisms is approximately…

A: Half-life is the time taken for the reactant to reduce the amount of the isotope to half its initial…

Q: A 1.000 g sample of strontium-90 decays to 0.900 g after 2.5 years. What is the half-life? How much…

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Q: How long does it take for 78% of a sample of cobalt-60 to decay (the half-life is 5.26 years)?

A: To solve this problem we have to first calculate the rate constant of the reaction by using half…

Q: The half-life of 223Ra is 11.4 days. How much of a 200.0 mg sample remains after 600 hours?

A: Since,           24 hours = 1 day Therefore, 600 hours = 60024  day…

Q: The half-life of bromine-74 is 25 min.  How much of a 4.0 mg sample is still active after 75 min.

A: The integrated rate law expression for the first-order kinetics is: k = 1tlnAoAAo = initial…

Q: A radioisotope “X” has a half-life of 2.5 years. Determine (to the nearest 0.1 mg) how much of a…

A: All the radioactive reactions follow first order kinetics . The term half life is defined as the…

Q: The isotope 22288Rn has a half-life of 3.8 days. How long does it take for 0.050 mmol to decay to…

A:

Q: (5) The half life of sodium-24, which diminishes by first order radioactive decay, is 15.0 hours. A…

A: Given, the half-life is for sodium-24 Time for first order decay = 15.0 hours Now, calculate the…

Q: The half-life of nitrogen-16 is 7.0 seconds. How long does it take for 100 mg of nitrogen-16 to be…

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Q: If 28.0% of a sample of gallium-66 decays in 4.46 hours, what is the half-life of this isotope (in…

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Q: The half-life of cobalt-60 is 5.20 yr. How many milligrams of a 2.000-mg sample remains after 9.50…

A: First of all let's see the given data in the question, Half-life of cobalt-60 ( t1/2 ) = 5.20 years…

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

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Q: Polonium-211 has a half-life of 12 years. How much of a 32 gram sample remains after 60 years?

A: We know nuclear decay follows first-order reaction so- relation between decay constant and half life…

Q: The half-life of cobalt-60 is 5.20 yr. How many milligrams of a 2.000-mg sample remain after 9.50…

A: Given information,     The half-life of cobalt-60 is 5.20 yr.     Mass of sample 2.000-mg     Time…

Q: he half-life of polonium-210 is about 140 days. How much of a 150g sample remains after t years?

A: The rate of the reaction is referred to the change in the molar concentration in the distinct…

Q: What is the half-life of an isotope that decays to 3.125% of its original activity in 63.6 h?…

A: We know that,  N(t) = N0(1/2)t/t1/2 No = initial amount  N(t) = amount of substance at time t t1/2 =…

Q: The half life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75min

A: Since the decay reactions are first order reactions  Hence the half life = ln(2) / K where K = decay…

Q: 13' 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: 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: plutonium 239 produced in breeder reactors has a half-life of 24100 years how long will it take for…

A: Answer: Time for 10% decay of Pu-239 is 3665.175 years

Q: The half-life of 14C is 5,730 yr. Assuming some charcoal from a campfire 29,000 years old was found,…

A:

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.