How many days would it take for one‑fourth of the 4.25g sample to decay?

Q: The half-life of 26?? 59 is 44.6 days. How long will it take for 95.0% of a sample of this nuclide…

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Q: = 176.5 h) to decay. Use the Calculate the time required for 46.80 % of a sample of X (t, formula…

A: Given : Half life i.e t1/2 of reactant (radioactive isotope) = 176.5 hr. And percent of reactant…

Q: Write a nuclear reaction for each step in the formation of 21785At from 23793Np, which proceeds by a…

A: The alpha decay can be described as the decay in which the mass number of the substance will be…

Q: Find the initial amount of a radioactive element with a half-life of 21.7 hours, when the remaining…

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Q: Lead-210 has a half-life of 22.3 years.   a) How much of a 102-mg sample would be remaining after…

A: Half life period is given by t1/2=0.693k Where, k is rate constant.

Q: How much time in years (assume a 365 day year for each year) would it take for a 1.805 g sample of…

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Q: if the passing of five half -life leaves 50.0g of a of radioisotope sample, how much was present in…

A: Mass of sample after 5 half life = 50 g Initial amount = ?

Q: A sample of polonium-210 has a half-life of 138 days a)What fraction of polonium-210 remains after…

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Q: Iodine-131 has a half life of 8 days. This means that after 8 days, half of the original mass of the…

A: Part A Since Iodine-131 has a half-life of 8 days, which means every 8 days the mass reduces to…

Q: 1. _Radioactive dating uses the half-life of different radioactive material to test the of a sample.…

A: 1.Nuclear stability radioactive dating uses the half-life of different radioactive material to test…

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

A: The maximum distance that the cyclotron can be transported has to be given,

Q: what percentage of the strontium-90 that was made 1945 still exsist now in the year 2021? the…

A: Given , Strontium -90  half life t1/2=28.9 initial concentration (concentration in 1945) = CA0 final…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A: Since this is a first order decay The rate constant with half life is given by…

Q: Magnesium-27 is an unstable radioisotope. For it to become stable, it has to undergo

A: Mg has 27 mass no. and 12 atomic number. Hence, it has 12 protons and 27-12 = 15 no. of neutrons.…

Q: After 52 hours of decay, only 0.06m of Cu-64 remains from the original sample of 1g. What is the…

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Q: . A sample of lodine-131 decays for three half-lives. At this point there is 0.75g of lodine-131…

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Q: How many half lives will it take for 50 g of "Tc to decay to 6.25 g?

A: Half-life period was discovered by ernest Rutherford in 1907. Rutherford applied the principle of a…

Q: Use the radioactive decay curve of iridium-192 to answer the three questions A. If the initial…

A: Radioactive decay is the procedure in which the energy of an unstable atomic nucleus falls by…

Q: The half-life of Polonium-218 is 3.00 minutes.  How many half-lives pass after 18.0 minutes ?  The…

A: Concept - Radioactive decays are first order reactions. So we use the formula, Nt = No(1/2)n, where…

Q: A certain artifact is tested by carbon dating and found to contain 73% of its original carbon-14. As…

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Q: 1a) How long will it take for 30 g of 222Rn to decay to 7.5 g? 1b) How many grams of 1°N will be…

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Q: Time (days) If the initial sample is 2.25 g, what mass of the original iridium-192 remains after…

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Q: The half-life of radium-226 is 1600 years. Suppose we have a 22-mg sample presently. (a)  How much…

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Q: How many of the nuclei of a radioactive sample containing 2048nuclei decay in 3 years, if its half…

A: The number of nuclei of a radioactive sample containing 2048 nuclei that decays in 3 years is to be…

Q: A The balf-life of barium-131 is 12 days. How many grams remains after 60 days if the initial sample…

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Q: The half-life of 51Cr is 2.78×101 day. Calculate how much time it would take for an isolated…

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Q: c) What percentage of the isotope will remain after 115 days lfur 25. alpha beta and

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Q: Radium-221 has a half of 30 sec. How long will it take for 82% of a sample to decay?(Round your…

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Q: The time it takes for half of a radioisotope's atoms to decay (like Carbon-14) ___.   is used to…

A: Half life is the time required by a quantity or a substance to reduce to half of its initial value.…

Q: If the initial sample is  1.25 g,  what mass of the original iridium‑192 remains after  65  days?…

A: Given, mass of sample = 1.25 g time, t = 65 days mass remained =0.675 g

Q: Use the References to access important values if needed for this question. Complete the following…

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Q: alf-life of a radioactive substance is 3.8 hrs. After how many hours 30% of its original value…

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Q: How many of the nuclei of a radioactive sample containing 2048 nuclei decay in 3 years, if it's half…

A: Half life of a radioactive sample is the time in which half of the sample is decayed i.e. 50% of the…

Q: A sample of 113m In has a half life of 100 minutes. What amount of 113m In remains (in CPM) if a…

A: An exponential decay can be described by the formula:

Q: The radioactive decay of Cs-137 is displayed in the plot below. 100 90 80 70 60 50 40 30 20 10 20…

A: We have to calculate  A. Half life  B.mass left  C. Percentage of original sample left

Q: i) The possible decay series from radon-222 to produce lead-210 is as follows: 2ERN → 21Po 214Pb →…

A: Radioactive nuclear reactions are the reactions in which there will be changes in the mass number…

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

A: The decay process has an exponential decay, which in this case means that every 1.83 hours, half the…

Q: Suppose a small quantity of radon gas, which has a half-life of 3.8 days, is accidentally released…

A: To calculate the number of days the laboratory remains evacuated

Q: rock containing 238U and 206Pb was examined to determine its approximate age. The molar ratio of…

A:

Q: A decay sequence for a radioactive atom of radon 219 to stable lead 207 atom is as shown below.…

A: Radioactive deacy is the spontaneous breakdown of atomic nucleus from nucleus and release energy and…

Q: very unstable francium-221 is produced. Giver f-life of francium-221 is only 5.00 minutes, if th…

A: Given,  Half life time (t1/2) = 5.00 minutes Decay constant (k) = 0.693/5.00     =  0.1386 min-1…

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

A: Since you have posted multiple independent questions in the same request, we will solve the first…

Q: The isotope 261-Lr decays by a emission with a half-life of 2.7 min. How many minutes will it take…

A: As we know the Decay equation: λ=1tlnaoa a0= Initial concentration a= Concentration left after time…

Q: Thoron has a high average annual radiation dose according to the graph. Iti eavy radioisotope formed…

A: No

Q: How many alpha particles are emitted per minute by a 0.0010-g sample of 238U that has been freshly…

A: Given, Mass of sample = .001 g Half life of uranium = 4.47 x 109 years = 4.47 x 109 x 3.156 x 107…

Q: Write a nuclear reaction for each step in the formation of 208Pb from 228Th, which proceeds by a…

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Q: Calculate the percent activity of the radioactive isotope cobalt-60 remaining after three…

A: Here we are required to find the percent activity of radioactive isotope of cobalt 60 remaining…

Q: If 600,0g of 14C decays after 3 half lifes, how much of the sample would remain ( in grams)?

A: Recall the following relation to calculate amount of radioactive sample remain after a definite time…

Q: Calculate the percent activity of the radioactive isotope iodine-131 remaining after two half-lives.…

A: Interpretation -  Calculate the percent activity of radioactive isotope iodine -131 remaining after…

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.