Sr-90 has a half-life of 28.8 years. Beginning with 15.0 of Sr-90, how much will remain after 145 years. g Sr

Q: If 1 g of an isotope has a half life of 15 hr, the half life of 0.5 g sample is A. 15 hr B. 30 hr C.…

A: 1 g sample of an isotope has a half - life = 15 hr 0.5 g sample of an isotope has a half - life =?…

Q: An 16 g sample of an isotope of Strontium-90 was formed in 1960 explosion of an atomic bomb at…

A: In what year will only 0.625 gm of strontium 90 remain?

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: If the amount of a radioactive element decreases from 2.4 g to 0.30 g in 12 days, what is its…

A: Given: Initial amount of radioactive element, N∘=2.4gFinal amount of radioactive element, N =…

Q: 18. Americium - 241 has a half life of 432 years. If you have 25g of Americium - 241, how much will…

A: Given : Half life (T) = 432 years Mass (No) = 25 grams  Time (t) = 864 years Mass left after 864…

Q: Complete the table for the radioactive isotope. Isotope 239 Pu, Half Life (In years) 24100, Initial…

A: The amount of time required by an element to reduce to half its quantity is called its half-life.

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: An 39 g sample of an isotope of Strontium-90 was formed in 1960 explosion of an atomic bomb at…

A:

Q: lodine has a half-life of 8.07 days. What fraction of a sample of iodine-131 will be left after…

A: The given information is as follows: The half life of the Iodine = 8.07 days The fraction of sample…

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

A:

Q: A theoretical isotope X-100 has an initial mass of 500g. This isotope has a half-life of 8 hours.…

A: GivInitial mass=500g Half life=8 hours

Q: If the half-life of a radioactive substance is 500 million years and you have 48 atoms of it, how…

A:

Q: The half life of Radium-226 is 1590 years. If a sample contains 500 mg, how many mg will remain…

A: given :-  initial amount of sample = 500 mg  half life = 1590 years  To calculate :-  amount of…

Q: If you have a sample of radioactive material that weighs 2 grams, and only 1 gram is left that is…

A: Initial nuclei = 2 grams. Reduced nuclei = 1 grams. Time = 5 years. Half life time of material = ?

Q: Technetium-99 (half-life = 6.0 h) is used in medical imaging. How many half-lives would go by in 18…

A: technetium - 99 have half life = 6 hours

Q: Iodine-131 has half life of 9 days meaning that after every 9 days the amount of isotope is reduced…

A: The half-life of Iodine-131 is 9 days. Initial amount =10.0 g  Time = 18 days. 18 days means => 9…

Q: Iodine-131 has a half-life of 8.04 days. If you begin with 2.7 mg of radioactive "I what mass…

A: Half-Life: The half-life of a radio active material will tell us the time it takes for one-half of…

Q: days. Suppose the initial amount of Thorium-234 is 192.9 mg, find the amount of Thorium-234 remains…

A:

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

A:

Q: lodine-131 has a half-life of 8.1 days. How much of 2 g of the isotope will remain after 56.7 days?…

A: The nuclear half-life of a radioactive isotope tells you how much time must pass in order for half…

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: The half-life time of a radioactive element is 6.0 days. A sample of 50.0 g of this element is…

A:

Q: 19. The half-life of the radio-isotope iodine - 131 is 8 days. What fraction of the original iodine…

A: Half life of the reaction is the time in which the reactant becomes half of the initial reactant. It…

Q: 1. If gallium - 68 has a half-life of 68.3 minutes, how much of a 160.0 mg sample is left after 1…

A: One half life is that time in which half of the radioactive substance gets decayed.

Q: Lead-200 has a half-life of 21.5 hours. Starting with 1.96 mg of this isotope, how much O 0.110 mg…

A: We will use first order kinetics formula

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A:

Q: Part 1.1. If a radioactive element has a half-life of 2.5 million years, the amount of parent…

A:

Q: Initial Amount After Half-life (years) Isotope Оuantity 1000 Years 33. 226RA 1599 10 g 94. e 5715…

A: in radioactivity is defined as unstable nuclei is decay into stable nuclei and emits electromagnetic…

Q: A laboratory investigation shows that a sample of uranium ore contains 5.37 mg of 238/92 U and 2.52…

A:

Q: An 22 g sample of an isotope of Strontium-90 was formed in 1960 explosion of an atomic bomb at…

A:

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: 32p is a radioactive isotope with a half-life of 14.3 days. If you currently have 32.7 g of 32P, how…

A:

Q: The isotope Ga-68 has a half-life of 68 minutes. If a diagnostic test is begun with 15 mCi of this…

A:

Q: Technetium-99 (half-life = 6.01 h) is used in medical imaging. How many half-lives would go by in…

A: Given that technetium - 99 have a half life of 6.01 hours

Q: lodine-131 has a half-life of 8. l days. How much of 2 g of the isotope will remain after 56.7 days?…

A: Half-life of iodine = t1/2 =  8.1 days intial amount = A0 = 2 g  final amount = A =  ? g  Time given…

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: What is the half-life of Californium- 252 based on the graph below?

A:

Q: 0 Question 9 180pb has a half-life of 25.5 s. If a sample of this isotope is initially 750.0 g, what…

A:

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: An 80-mg sample of technetium-99m is used for a diagnostic test. If Tc-99m has a half-life of 6.0…

A: Given  Initial Amount of Sample (A)0 = 80 mg  Half life ( t1/2 )  = 6 hour Time ( t )   = 24 hour…

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

A: Correct option is (b) 25%

Q: The half-life of 98AU is 2.7 days. If you begin with 5.6 mg of this gold isotope, what mass remains…

A: Half-life is the time required for the reaction to be half completed. It is denoted by t1/2 . For a…

Q: A radioactive isotope has a half-life of 10,000 years. How old is the rock if the ratio of…

A: Ans

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

A:

Q: The 175Pt isotope has a half-life of 2.53 seconds. What percentage of the original quantity of 175Pt…

A: The radio active decay follows first order kinetics. The half life t1/2 and rate constant K of a…

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

A:

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…

Q: If Bismuth-210 has a half-life of 5.0 days and you started with 30.59 grams then how many grams of…

A: Introduction: Half - life = 5 days or 120 hours Initial amount = 30.59 g Time = 6.25 hours