A particular radioactive element has a half-life of 63 days. What percent of the original sample is left after 189 days? Group of answer choices 12.5 % 75 % 33.33 % 50 % 25 %

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: 4. Tritium has a half-life of 12.5 years. If you had a sample of 8.00g of tritium today, how many…

A: Half life (T) = 12.5 years  Time (t) = 37.5 years  Original sample (No) = 8.00 grams  Undecayed…

Q: Carbon-14 is used in radiocarbon dating. The half-life of carbon-14 is 5.73*10^3 years. How many…

A:

Q: (13) What is the total binding energy of a scandium-45 atom? The mass of the atom is 44.95591 amu.…

A: Given: The mass of the scandium-45 = 44.95591 amu We have to calculate the total binding energy of a…

Q: If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of…

A: Given : Half life of I-131 = 8 days Initial amount of I-131 = 10 mg And time passed = 24 days

Q: One of the stable isotopes of Mg is Mg-24 What is the atomic number of Mg   Enter whole number only…

A: Given  isotope of Mg -24  a) Atomic number is defined as the number of protons present in the…

Q: A sample of tin contains 10.00 micrograms of tin-123.  Determine the activity of the sample in…

A:

Q: A radioactive isotope has a half-life of 12.0 seconds. How much of a 100 gram sample is left after…

A: Given  Half life of radioactive isotope ( t1/2 )  = 12 second  Initial Mass of sample   ( A )0 = 100…

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: The radioactive isotope 1 Pa decays by beta emission. If the mass of a sample of protactinium-234…

A: The question is based on the concept of nuclear chemistry. we have to calculate the half life of the…

Q: 32.  A specimen of charcoal found contains 57% as much 14C as a sample of present day charcoal. What…

A: Given : Half life = 5700 years

Q: Number of years Mass of original Carbon 14 remaining (grams) Half-life 1 1/2 5,700 2. 1/4 11.400 1/8…

A: After a half-life period, the mass of the reactant becomes half of the initial mass. So amount…

Q: If we start with 1000 radioactive parent atoms and a half-life of 50 years. How many parent atoms…

A: Given,  Initial concentration = 1000 atoms       t12 = 50 years   To find = concentration after 200…

Q: 100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will…

A: Radioactive decay follows first order kinetics. Given that half life is 36 hours. So the rate…

Q: A 450.0-mg sample of technetium-99m was used for a diagnostic test.  If technetium-99m has an…

A: Given - Initial amount=450.0mg Half life=4.8h Time=48h

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: the Cs-131 by life has a half life of 30 years. after 120 years, 2.6 g remain. what is the original…

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Q: The half-life of Ga-67 is about three days. If only 12.5% of the original sample remains, the time…

A: The time at which reactant's amount is left half of the original amount is known as half-life. The…

Q: Calculate the binding energy per nucleon of helium-3 on the basis of the following masses: Particle…

A: Binding energy :-         It  is the minimum amount of energy that would be required to breakdown…

Q: The half-life of In-111 is about 3 days. If only 12.5% of the original sample remains, the time…

A: Given  Remaining Amount [ A ]t = 12.5 %  Let initial Amount [ A ]0    = 100%  Half life ( t1/2 )…

Q: Calculate the change in energy, in kilojoules per mole, for the transmutation of radium from the…

A: Change in energy for a nuclear reaction is cakx using formula  ∆E = ∆m × c2  ∆m is change in mass  c…

Q: Solve the following problems and show complete solution. A. Half life of Sr90 is 29 years. What…

A: A.     Half life of Sr-90 ( t1/2) = 29 y           Let ' t '    =  100 y       n × t1/2   =  t…

Q: Indium-116 is radioactive and has a half life of 14.10 seconds. Calculate the activity of a 3.3 mg…

A: Here we are required to find  the activity of 3.3mg of radioactive indium 116 in the unit of Ci and…

Q: Which of the following would have the greatest amount (in moles) of the original isotope remaining?…

A: The half life time of isotope is the time required for the isotope to Decreases it's Concentration…

Q: A particular radioactive isotope has a half-life of 3. weeks. What fraction of the original sample…

A:

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

A:

Q: The half-life of a certain radioactive element is such that 7/8 of a given quantity decays in 12…

A: Note: As per our guidelines, we are supposed to answer only one question when multiple questions are…

Q: Certain radioactive isotope has a half-life of 3.9 minutes. If we initially have 7168 grams of this…

A: According to the question, we have: Half life of radioactive isotope = 3.9 minutes.  Initial mass =…

Q: Tritium (3H) has a half-life of 12.3 years. If there are 200g  of tritium at the beginning,…

A: Initial mass = 200 g  Half life = 12.3 years  We need to determine the mass after 2 years and 34…

Q: I0. Radium has a half-life of 1600 years. This means that after four half-lives, the total…

A: Since you have posted multiple questions as per guidelines we can answer one per session . If you…

Q: Element X has a half life of 9 days and decays into element Y. How much element Y is created after…

A:

Q: a 16.0 g sample of radioactive oxygen-11 has a half life of 3.0 minutes. How much will be lett after…

A: The time is needed for the concentration of reactant to decrease the half compared to the initial…

Q: Neptunium-237 has a half-life of 2.1 million years. The amount N of 400 kilograms of neptunium-237…

A: Exponential decay According to decay law, it calculates the amount of undecayed nuclei in a…

Q: Mr. Albedo stumbled upon an unknown material in an abandoned laboratory. He believes that this…

A:

Q: Each statement that follows refers to a comparison between two radioisotopes, A and X. Indicate…

A: a)

Q: how many grams of tritium would you have in 37.5 years?

A:

Q: Assuming two samples of radioisotopes both contain the same number of atoms, the activity of the…

A: An element remains 50% of the original amount in its half-life period.

Q: 182Ta is a radioisotope with a half-life of approximately 114 days.  A student works with a sealed…

A: Atomic no. of Ta = 73 Mass number of Ta = 182 Determination of no. of neutrons: n=Mass no.-Atomic…

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

A:

Q: Half-life of Element X mass of 60 How much of the parent isotope exists after 3 half-lives? Element…

A: Initial mass of element = 100

Q: All the disintegrations of a sample of an unknown nuclide weighing 4.6 x 10-2 g were counted. In the…

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Q: What percent of a parent isotope would remain after two half lives?  50% 25% 13% 66

A: Correct option is (b) 25%

Q: A certain radioactive isotope has a half life of 15 minutes.  What fraction remains after 1 hour?…

A: Given, A certain radioactive isotope has a half life of 15 minutest12 =15 minwe are asked to…

Q: What is the binding energy (in Joule per nucleon) of 60Ni? Given 60Ni = 59.9308 amu, 1 electron =…

A: Given , Element : N60i

Q: What percentage of a radioactive substance remains after 5.00 half-lives have elapsed? O 12.5% O 50%…

A: Number of half life = 5 half life

Q: Cobalt-60 is a beta emitter with a half life of 5.3 years. Approximately what fraction of cobalt-60…

A:

Q: The half-life of 14C is 5730 years. A sample contains 90.8 % of the 14C that it would contain if it…

A: Age of a given sample can be calculated using Carbon dating method :

Q: Cesium-131 has a half-life of 9.7 days. What percent of a cesium-131 sample remains after 64 days?…

A:

Q: 55Fe is a radioisotope with a half-life of approximately 3 years.  A student works with a sealed…

A: A/A°=e^-Lambda t

Q: Technetium-99m is an important isotope used in medical imaging (the m stands for metastable).  Each…

A: The time required to reduce the concentration to half of the initial concentration of the substance…

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.