Radium-226 (atomic mass = 226.025402 amu) decays to radon-224 (a radioactive gas) with a half-life of 1.6 × 10^3years. What volume of radon gas (at 25.0 °C and 1.0 atm) is produced by 25.0 g of radium in 5.0 days? (Report your answer to two significant digits.)

Q: The half life for the decay of carbon-14 is 5.73 × 10’ years. Suppose the activity due to the…

A:

Q: An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of…

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

Q: Suppose the amount of a certain radioactive substance in a sample decays from 4.60 mg to 1.90 mg…

A:

Q: The half-lives of different radioisotopes are given in the table. Radioisotope Half-life (min)…

A: We know that,→ Radioactivity Phenomena follow first oroen kinetics.So, Rate = KA1 K → Rate…

Q: The half-life of 234U, uranium-234, is 2.52 105 yr. If 98.9% of the uranium in the original sample…

A:

Q: If you have 1 gm of pure potassium 40 (40K) that is experimentally determined to emit about 105 beta…

A: Activity of 40 K = 105 beta rays. The decay constant λ can be calculated as follows:

Q: Beginning with 1.00 g of a sample of an unknown radioactive isotope, 0.05674 g of the isotope will…

A: The answer to the following question is-

Q: If the mass of a sample of radioactive cesium-137 decays from 71.9 milligrams to 20.8 milligrams in…

A: The integrated rate law expression for the first-order kinetics is: Half-life relates to the rate…

Q: A pure sample of tritium, 3H, was prepared and sealed in a container for a number of years. Tritium…

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Q: Answer  4460 years

A: Expression for half-life period of radioactive element is given as,

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

A:

Q: Radioactive calcium-47 decays with a half-life of 4.5 days. A chemist obtains a fresh sample of…

A: Half life of sample T = 4.5 days Final radioactivity A' = (100-25) % of A = 75 % of A.  A is initial…

Q: The half-life of radium-226 is 1.60 × 10' yr. How many hours will it take for a 2.50-g sample to…

A: The decay reactions are first order reactions. Hence for the first order reactions we can say that…

Q: The half life of an isotope is 43 seconds.how long does it take 100.00 g of isotope to decay to 6.25…

A: Given data contains, Half-life of an isotope is 43 seconds. Mass of isotope before decay is 100.0 g.…

Q: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life?

A: Given is the radioactive isotope.We know any radioactive decay follows first order  reaction…

Q: The half life for the decay of carbon-14 is 5.73 × 10° years. Suppose the activity due to the…

A: Given: Half-life of carbon-14 decay = 5730 years. Activity of carbon-14 in the sample = 51 Bq. And…

Q: A radioactive substance decays at a rate proportional to the amount present. If 45 percent of a…

A: Given :   Time (t) = 20 years  Percentage of substance decays = 45 %

Q: The half life for the decay of carbon-14 is 5.73 x 10° years. Suppose the activity due to the…

A: Here by applying first order disintegration equation ,we can determine the age of artifacts.

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

A: Radon 222 is a radioactive substance which undergoes radioactive decay Here we are required to find…

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: 17. If it takes 12 half-lives for a radioactive chemical (k = 4.85 x 10-2 day¹) to decay to a level…

A: Half-life is the time taken for half of the radioactive atoms of a specific radionuclide to decay

Q: 7. If uranium-238 has a half-life of 45 billion years, how many years would it take for a 10-gram…

A: The half-life is the time required to reduce one half of the initial concentration of the substance.

Q: A sample of Uranium-234 has been decomposing. If the original mass of 234U is 2.57milligrams, how…

A:

Q: The half life for the decay of carbon-14 is 5.73 × 10 years. Suppose the activity due to the…

A: Given that : Half-life of carbon-14 = 5.73 x 103 years The activity due to the radioactive decay =…

Q: A radioisotope has a half-life of 8.7 h. What mass of the radioisotope will be left after 24.5 h if…

A: The objective of the question is to find out the the mass of radioisotope left after 24.5 h.

Q: The number of a certain radioactive nuclide present in a sample decays from 59,122 to 429 in 9.23…

A: Given: No=59122Nt=429t=9.23 days Half life of the radioactive species refers to the time required to…

Q: 2. The isotope cesium-137 has a half-life of 29.75 years. How long will it take a 100 gram sample of…

A: First-order reaction: The type of reaction which depends only on one substance is called a…

Q: The noble gas radon has been the focus of much attention because it may be found in homes. Radon-222…

A: Half life time = 3.82 days  Concentration decreases to 10% of original.  Let initial concentration =…

Q: Chemistry An unknown radioactive substance has a half-life of 3.20 hourshours . If 34.7 gg of the…

A: All natural and artificial radioactive decays follows first order kinetics The integrated rate…

Q: The half life for the decay of carbon-14 is 5.73 x 10³ years. Suppose the activity due to the…

A: We need to calculate age of the wood sample

Q: After 19 days have elapsed, 1/21 of a radioisotope sample remains undecayed. What is the half-life…

A:

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: 3. What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in…

A: Given: Initial mass of nitrogen-16 (N0) = 100g Final mass of nitrogen-16 (N) = 12.5g Time (t) = 21.6…

Q: The half-life of cesium-137 is 30.2 yrs. If the initial mass of a sample is 1.00kg, how much will…

A:

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: Substance Q initially weights 120% of its remaining mass after its decay in 60 minutes. What is its…

A: Given  substance Q initial weight =120% of its remaining mass after its decay for 60 mins t=60…

Q: Radium-226 (atomic mass - 226.03), the only naturally occurring isotope of this element, follows the…

A: Since the half-life of the 2nd and 3rd decay are very small in comparison to the 1st one, the 2nd…

Q: What is the half-life of chromium-56 if 12.8 minutes are required for the activity of a sample of…

A: Radioactive decay follow first order kinectics . Half life for first order reaction  = 0.693/k  k is…

Q: The half life for the decay of carbon-14 is 5.73 × 10° years. Suppose the activity due to the…

A: Given: Half-life of carbon-14 decay = 5730 years. Activity of carbon-14 in the sample = 90 Bq. And…

Q: A sample of radioactive radon-222 was found to have a half-life of 3.823 days. What fraction of the…

A:

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: 1. Gold-198 is used in the diagnose of liver problems. The half-life of Au is 2.69 day. If you begin…

A: Given data: half life of 198Au = 2.69 day Initial concentration of  198Au is 2.8 μg Time = 10.8 day

Q: Stonehenge is an ancient megalithic site in southern England. Some believe it was designed to make…

A: Given: Sample=6 pound Carbon-14=0.33 Pounds t12=8333 years To find: Age of charcoal pits Solution:…

Q: Given the half-life of Carbon-14 is 5770 years, how much of a 540 gram sample is left after 10000…

A: For the given radioactive decay process: Rate constant, k =?  Half-life=5770 years According to…

Q: The half-lives of different radioisotopes are given in the table. Radioisotope Half-life (min)…

A: Given: Half life of argon = 1212 min. Time passed = 2424 min. And initial amount of argon = 4.8 g.

Q: What is the half-life of uranium-238 if 9.10×109 years are required for the activity of a sample of…

A: Given: 9.10×109 years are required for the activity of a sample of uranium-238 to fall to 24.7…

Q: Ca-60 is used extensively in radiotherapy, its half-life is 5.27 years. How many years will it take…

A: The given data is as follows: The half life Co-60 = 5.27 years The initial amount A∘= 100 The left…

Q: A 371.9 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

A: On passing a half life the concentration of the substance becomes half. Let the substance has passed…

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.