The half-life of 232Th is 1.4 x 100 yr. Find the number of disin- tegrations per hour emitted by 1.0 mol of 232 Th.

Q: The half-life of bismuth-210, 210Bi, is 5 days. (a) If a sample has a mass of 216 mg, find the…

A: The decay of radioactive elements follows first order kinetics. So we would use first order reaction…

Q: It takes 4 h 39 min for a 2.00-mg sample of radium-230 to decay to 0.25 mg. What is the half-life of…

A: Half life of first order kinetic reaction is given by:

Q: A laboratory investigation shows that a sample of uranium ore contains 10.88 mg of 238U 92 206…

A: Radioactive decay is the process where the unstable nuclei get converted into stable daughter nuclei…

Q: What is the half-life of bismuth-214 if 62.5 minutes are required for the activity of a sample of…

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Q: The half-life of cesium-129 is 32.0 hours. How much time is required for the activity of a sample of…

A: Radioactive decay follows the first-order kinetics. The decay constant (λ) and half-life of a…

Q: Krypton-79 has a half-life of 34.50 h. After 138.0 h, 54.25 kg of this radioistope is left. How much…

A: Given, the half-life of Krypton-79 is 34.50 hthe amount of radioisotop left after 138.0 h is 54.25…

Q: 9.) Cesium-134 undergoes decay by B emission and has a half-life of 2.0 years. How much of a 3.50-g…

A: Given:                 Half life of Cesium-134 is 2.0 years                 Taken mass of Cesium-134…

Q: Gold-198 is used in the diagnosis of liver problems. If the half-life of Au-198 is 2.69 days: b. If…

A: Half life = 2.69 day Initial amount = 9.21 mg  Time = 72.9 days

Q: The half-life of cesium-129 is 32.0 hours. How much time is required for the activity of a sample of…

A: Half life, t1/2 = 32 hours t1/2=32 hoursk = 0.693t1/2=0.69332 hours=0.02166 hour-1

Q: A sample of rock was found to contain 8.23 mg of rubidium-87 and 0.47 mg of strontium-87.(a)…

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Q: 40K decays to 40Ar with a half life of 1.27x10^9 years. What is the age of a rock in which the…

A: Recall the expression of remaining amount due to radioactive disintegration Remaining amountA=A∘2nSo…

Q: The half-life of cesium-129 is 32.0 hours. How much time is required for the activity of a sample of…

A: Given  Half life of cesium - 129 =  32 hours  Remaining activity [ A ] = 14.5 %  Time ( t ) = ?

Q: A sample of TI-201 has an initial decay rate of 5.88 x 10' dis/s. How long will it take for the…

A:

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

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Q: A 1.00-gram sample cantains two radioactive isotopes A and B. The half-life of isotope A is 2 hrs.…

A:

Q: 8. How long will it take for a sample of plutonium -239 with a half-life of 24000 years to decay to…

A: Given information : plutonium-239 Half life (t1/2) = 24,000 years Initial amount = Ao Final amount…

Q: The half-life of protactinium-231 is 3.25 x 104 years. How long will it take for 43.4 grams of…

A: Find out the time period by using the formula, Where,              Ao = Initial amount  At = Amount…

Q: The isotope ²¹²₈₃Bi has a half-life of 1.01 yr. What mass (inmg) of a 2.00-mg sample will remain…

A: Given, half life of  ²¹²₈₃Bi ,  t1/2 = 1.01 yr = 365 x 24 x 1.01 h = 8847.6 h            initial…

Q: 1.Element F has a quarter life of 10 hrs. If there are 925 milligrams remaining of element F after…

A: SOLUTION: A = AoE-KT  (First order reaction) Quarter life = 10Hours At quarter life A=3Ao/4 3Ao/4 =…

Q: Thallium-201 is used medically to diagnose heart problems. The half-life of thallium-201 is 72.9…

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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: What is the half-life of radium-226 if 3.41x10 years are required for the activity of a sample of…

A:

Q: The half-life of Po-214 is 0.001 seconds. How much of a 10 gram sample is left after 0.003 seconds?…

A: Rate of a reaction determines the speed with which a reaction proceeds. First order reaction is a…

Q: 1.What is the half-life of 99Tc if a 500.0 g sample decays to 62.5 g in 639,000 years 2)How much of…

A: Given,Mass 500 g,Therefore, the first half-life is 250.0g.Second half-life is 125.0g.Third half-life…

Q: How long does it take for 105 mg of tritium H to decay to 35.0 mg? The half-life of tritium is 12.3…

A: All radioactive decays are first order reaction.

Q: The half life of 52Fe is 8.28 hours. Suppose we measure the activity of a sample containing 52Fe and…

A: Calculation of disintegration constant (λ):T1/2 of 52Fe is = 8.28 hours.

Q: Thallium-201 is used medically to diagnose heart problems. The half-life of thallium-201 is 72.9…

A:

Q: II 24 Iours, what is the half-life of Ra-226 in years? 27 3. Arsenic - 70 has a half life of 140…

A: As per our guidelines we can only solve first question. Please resubmit the other questions as next…

Q: 2. Strontium-90 has a half-life of 28 years. If a sample was tested in 1980 and found to be emitting…

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Q: Radiation seed therapy is a common method for treating some prostate cancers and brain tumors.…

A: Radioactive degradation follow first order kinetics.

Q: A 1.00 g sample of Ge decays to 0.87 g in 1.9 hr. What is the half-life of Ge ? 32 a. 0.073 hr b.…

A: Decay reactions are first order reactions. Given : Initial mass of reactant = 1.00 g Final mass of…

Q: What is the half-life of gallium-74 if 32.1 minutes are required for the activity of a sample of…

A:

Q: How many half-lives does it take a 10.0 gram sample of 12353I to drop to 0.625 grams? What length…

A: The time has to be calculated

Q: How many milligrams remain of a 15.0 mg sam- ple of radium-226 after 6396 years? The half-life of…

A:

Q: A laboratory investigation shows that a sample of uranium ore contains 8.11 mg of U (molar mass…

A: Given data: Mass of U-238 = 8.11 mg Mass of Pb-206 = 2.33 mg Half-life of U-238 = 4.5 x 109 years…

Q: 21. Half-Life The half-life of radium-226 is approximately 1620 years. a. How much of a sample…

A: Introduction: We know that this decay of radioactive elements is a type of first-order reaction. The…

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 of Th-232 is 1.4 x 10^10 years. If there are 50.0 g of the sample left after 5.6 x…

A: Calculate number of half-life:

Q: Iodine-131 is an important radioisotope of iodine that has a radioactive decay half-life and is…

A: Radioactive decay follows first order rate law, we can mathematically expressed it as At = Ao…

Q: The half-life of Po-214 is 0.001 seconds. How much of a 10 gram sample is left after 0.003 seconds?…

A: We know radioactive decay follows first order reaction kinetics, therefore  t1/2=0.001 s and…

Q: Radiocarbon dating techniques are used to determine that a very old piece of bone emits emits about…

A:

Q: What is the half-life of thallium-209 if 4.20 minutes are required for the activity of a sample of…

A: The radioactive disintegration is a type of first order kinetics which has its half-life given as -…

Q: The half-life of stroncium-90 is 28 years. How long will it take a 50-mg sample to decay to a mass…

A:

Q: The half-life of 232Th is 1.4 x 10" yr. Find the number of disintegrations per hour emitted by 1.0…

A:

Q: Radiocarbon dating techniques are used to determine that a very old piece of bone emits emits about…

A: Calculate the number of half lives which have been involved in the degradation. If n is the number…

Q: A rock started with 4000 atoms of a parent radioactive isotope and now has 3750 daughter isotopes.…

A:

Q: A 10.00-g plant fossil from an archaeological site is found to have a 14C activity of 3094…

A:

Q: It takes 6400 years for one gram of a radioactive element to decay away to only 1/16 of a gram. The…

A: Given time = 6400 years M/M० = 1/16

Q: The half-life of ZN-71 is 3.2 minutes. If one had 120.0g at the beginning, how many gram would be…

A: Half lives formula  used  2n=[A0]/At Where  n= Half lives