145 g sample of radioactive has a half live of 6.4 days how many g of material is left are 2 half lives ?

Q: If the amount of a radioactive element decreases from 0.36 g to 90. mg in 22 min, what is its…

A: Half-life (t1/2) is defined as the time required by a substance to reduce to half of its initial…

Q: the half life of oxygen-15 is 2 minutes. what fraction of a sample of O-15 will remain after 5…

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Q: If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9% of the…

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Q: Pls. refer to the given answer choices so that i will know if my solution is wrong

A: 100% undecayed  at time 0 .

Q: How many half‑lives of the unknown radioactive substance have occurred?

A: As we know that decay of radioactive substance follows first order kinetics

Q: Carbon-14 Original amount: 60.0 g Amount left: 3.75 g Total time: Half-life: 5730 y Number of…

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Q: Consider a radioactive sample with a half-life of one week. How much of the original sample will be…

A: Half-life period is defined as the time taken for amount of the sample to reduce to half of its…

Q: A 739.7 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

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Q: If the half-life of 100.0 grams of a radioactive isotope is 8 years, how many grams will remain in…

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Q: 25. Iodine-131 is a radioactive substance that can be used to treat certain thyroid conditions. It…

A: Q25) Given that: Half life = 8 days Mass of Iodine = 40 mg Remain after 4 half lives = ?

Q: The radioactive nuclide has a half-life of 5.27 years. Calculate the mass of that remains from…

A: The amount of time that passes is a whole number multiple of the radioactive nuclide half-life.…

Q: How much (in grams) of a 17.2-g sample of some radioactive element (half-life of 4 days) remains…

A: The given mass of the substance =  17.2 g The half-life of the substance (t1/2) = 4 days Time…

Q: A radioactive isotope has a half-life of 11 minutes.  How many grams of a 18.68 g sample remain…

A: Given Half life = 11minutes = 11*60= 660 second Sample weight = 18.68g Time = 44 minutes = 44*60=…

Q: A sample contains 4 grams of carbon (half life 5730 years). How much carbon will remain after 1500…

A: The mass of the sample is = 4 gram The half-life of carbon is = 5730 years The amount of the sample…

Q: How much of a 0.15 g sample of U-238 after the passage of 3200 years? Half life is 4.01×10⁹ years.

A: Given: Mass of sample = 0.15g Duration of decay= 3200 years. Half life= 4.01×109 years To find: The…

Q: 1.) Carbon-14 has a half-life of 5600 years. If you had a sample of 100% carbon-14, how much would…

A: Given, carbon-14 half life with 100 % carbon-14 sample.we are asked to calculate the amount of…

Q: 1. Iron-59, which is used to diagnose anemia, has a half-life of 45 days. What fraction of it is…

A: As in the question, it is given that Iron-59 is used to diagnose anaemia and has a half-life of 45…

Q: I-131 has a half-life of 8.04 days. If a sample initially contains 20.0 g of I-131, approximately…

A: Interpretation -  To determine the amount of I-131 after 32 days when I-131 initially contains 20g…

Q: The radioactive nuclide has a shelf-life of 17.5 hours. What mass remains from 0.0100g sample after…

A: Shelf-life of 17.5 hours, Calculate the mass remains from 0.0100 g after 24 hours.

Q: If the half life of a radioactive isotope is 3 minutes, how much of an 8 Ci sample would remain…

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Q: 2. The half-life of radon-222 is 3.8 days. How much of a 100 gram sample is left after 15.2 days?

A: Given data contains, The half-life of radon-222 is 3.8 days. Mass of sample left after 15.2 days is…

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

A: Given  Initial Mass of Sample ( A)0  = 100 gram  Half life time ( t1/2)   = 12 sec  Time ( t ) = 36…

Q: 43. C-14 has a half-life of 5730 years. How many grams of a 4.00 g sample would be left after 3.5…

A: C-14 has a half life of 5730 years. This indicates if x grams of C-14 is available initially then…

Q: 10 half lives

A: 1/1024 fraction of original radioactive material remains after 10 half lives.

Q: Phosphorus-32 has a half-life of 14.0 days. Starting with 8.00 g of 32P, how many grams will remain…

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Q: 27. A radioactive substance weighs 30.0 grams and has a half-life of 2,460 years. How much will…

A: As  we know that all radioactive reactions are first order reaction. Given in the question, Mass of…

Q: The half–life of a radioactive material is 7.04 days. Assuming you start with a 1.45 mg sample, how…

A: Given , Half life = 7.04 days Time , t = 16 days Initial Weight of sample = 1.45 mg

Q: Lead-204 has a half-life of 15 minutes. Suppose there are initially 100 Pb-204 atoms. After 30…

A: The time in which half of the initial amount of the reactants convert into the product known as half…

Q: If the half-life of a radioactive isotope is 32 days, how many half-lives must pass before a 3.0…

A: Radioactive decay follows the first-order kinetics. The half-life of the first-order reaction does…

Q: A 169 ng sample of radioactive material has a half life of 3.9 days. How many ng of radioactive…

A: Sample of redioactive material=169ng Half life=3.9days

Q: At a given time, there are 1.2 mg of a radioactive substance present. After 6 hours there is only…

A: To solve this question, first find out the rate constant of radioactive substance and using that…

Q: An organism had 665 grams of Carbon-14 (a radioactive form of carbon) in it when it died. How much…

A: Carbon-14  is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8…

Q: After 31 years, what mass (in g) remains of a 45.0 g sample of a radioactive isotope with a…

A: Given, Half life (t1/2 )= 7.3 years time (t) = 31 years Number of radioactive atoms present…

Q: How much of a 0.230 g radioactive sample with a half-life of 8 hours would remain after a period of…

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Q: An organism had 170 grams of Carbon - 14 (a radioactive form of carbon) in it when it died. How much…

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Q: If 20% of the radioactive substance disappears in one year, find its half-life assuming exponential…

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Q: A radioactive sample contains 2.45g. How much willl remain after 11.4 days? (Half life is 3.8 days)

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Q: f 10.0mg of I-131 exists, how much will be left after 32 days?  (1/2 life of I-131 = 8 days)

A: Given : Initial mass of I-131 = 10.0 mg Half life = 8 days And time passed = 32 days.

Q: Iodine-131 has a half-life of 8.0 minutes. How many half-lives will pass in 120 minutes?

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Q: The half-life of bismuth-212 is 1 hour. If 12g of bismuth are allowed to decay, what mass of bismuth…

A: The time taken during a reaction to reduce the concentration of a reactant to half of its initial…

Q: If you have 2.00 grams of a radioisotope, with a half-life of 5 days, how much of the isotope is…

A: Given;

Q: Phosphorus-32 has a half-life of 14.0 days. Starting with 4.00g of P, how many grams will remain…

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Q: Define the term half-life and illustrate it with an example.

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

Q: An 80.0 g sample of iodine-131 was placed in a sealed vessel forty days ago. Only 2.5 g of this…

A: Decay reactions are first order reactions. Since we know that the relationship between the amount of…

Q: A certain radioisotope has a half-life of 9.54 days. What percentage of an initial sample of this…

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Q: A radioactive sample has a mass of 500 grams. How much remains after two half-lives?

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Q: A radioactive iodine sample has a half life of 6 days. If the original sample is 24 grams, how much…

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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…