The half life of 231Pa is 3.25 x 104 years. How much of an initial 10.40 microgram sample remains after 3.25 x 105 years?

Q: How long will it take a radioactive sample of iodine-131 (half-life 8.07  d ) to lose 99.2  %  of…

A: The given disintegration reaction is first order reaction. Half life t1/2 = 0.693 / K 8.07 days =…

Q: The first-order decay of radon has a half-life of 3.823 days.  How many grams of radon remain after…

A: Ans

Q: Substance D initially weights 56 grams. After 6 minutes, it was observed that its mass decreased by…

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Q: The half-life of element X is 500 years. If there are initially 8 g of X, how much will remain after…

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Q: Krypton-81 has a half-life of 2.29 × 105 years. A 750-mg sample of Krypton-81 undergoes electron…

A: Since you have posted a question with multiple sub-parts as per our company guidelines we are…

Q: Radon has been the focus of much attention recently because it is often found in homes. Radon-222…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: What was the original mass of a sample if 0.0750 grams remain after 11.47 days?

A: Given, The half life of Rn-222 is 3.823days.   0.0750 grams remain after 11.47 days  The original…

Q: How long (in hours) would it take to disintegrate 3.17 × 1017 atoms from a 12.0-mCi (millicurie)…

A: Activity = 12.0 mCi = 12 * 10-3 Ci

Q: Element X has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10…

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Q: The half-life of element X is 20 days. How much of an 80 g sample remains after 80 days?

A: Given :  Half life of element = 20 days  Initial amount of sample = 80 g  To calculate :  Amount of…

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

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

A: Some nuclei are unstable and undergo a loss of energy in the form of radiation. This process is…

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

A: Answer: Since, nuclear reactions are first order reactions, therefore to solve this question we will…

Q: Calculate the half-life of a radioisotope if it takes 24 years for a sample to decay to 12.5% of its…

A: Radioactive decay follows first order kinetics. Half-life is the time taken by a radioisotope to…

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: Suppose the amount of a certain radioactive substance in a sample decays from 6.70 mg to 700. µg…

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Q: The decay constant for the element X is 6.931 yr⁻¹. What is the half-life?

A: Relation between decay constant (K) and half life (t12) of an element:-t12 =0.693K

Q: The half-life of 123I is 13 hr.  How much of a  64 mg sample of 123I is left after 26 hours?

A: The isotope of iodine, 123I, undergoes decay in accordance with first order kinetics. The half-life…

Q: 1.)There are 5.0 g of 121I left after 40.35 days. How many grams were in the original sample if its…

A: Half-life is the time required for an amount to reduce to half its initial value.From the given…

Q: The half life for the decay of carbon- 14 is ×5.73103 years.   Suppose the activity due to the…

A: The radioactive disintegration is the example of first order kinetics. The integrated rate equation…

Q: The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of…

A: Given, Half Life t1/2 = 800 years. A = 12.5%  Ao = 100 %  Time , t = ?

Q: The half-life of cesium-137 is 30 years. Suppose we have a 12-g sample. (a) Find a function  m(t) =…

A: Hello. Since your question has multiple sub-parts, we will solve the first three sub-parts for you.…

Q: 90 The half-life of "Sr is 28 years. How long will it take for a given sample of "Sr to be 83%…

A: 1) half life = 28 years  Decomposed = 83 %  2) half life = 39.4 days

Q: The half-life of Radium-226 is 8 years. How much of an initial 171 g sample will remain after 43…

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Q: Suppose the amount of a certain radioactive substance in a sample decays from 7.10 mg to 5.20 mg…

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

Q: How much of a 500 g isotope sample is left after 62 hours if the lag life is 6.2 hours?

A: Given data: Time (t) = 62 hours Amount of isotope (A0) = 500 g Half life = 6.2 hours Formulas: t1/2…

Q: A radioisotope “X” has a half-life of 2.5 years. Determine (to the nearest 0.1 mg) how much of a…

A: All the radioactive reactions follow first order kinetics . The term half life is defined as the…

Q: Suppose the amount of a certain radioactive substance in a sample decays from 6.50 mg to 2.40 mg…

A: Radioactive decay is a first-order reaction. On applying the value for rate constant k, we find it…

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

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

A:

Q: The half life of 123I is 13 hr.  How much of a 64 mg sample of 123I is left after 26 hours?

A: Given,Half life of 123I is 13 hr

Q: Cobalt-60 is radioactive and has a half life of 5.26 years. How long would it take a sample to decay…

A: We have to calculate the time taken.

Q: If a tree dies and the trunk remains undisturbed for 1.775 × 10⁴ years, what percentage of the…

A: Given-> Half life = 5730 year  Time = 1.775 × 104 year.

Q: original

A: t1/2 =  8.02 days t = ? for 99% decay

Q: The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175…

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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: A radioactive of an unknown element is an extremely hazardous species. If a 79 gram sample of the…

A: Given: Initial amount, a=79 g The final amount, a-x=37 Time =37.9 yr Rate constant=? half-life =?

Q: A 53.8-mg sample of sodium perchlorate contains radioactive chlorine-36 (whose atomic mass is 36.0…

A: radioactive nuclie undergo sponteneous decay reaction to produce stable products. The time for the…

Q: (8) The radiation intensity as a function of time is given by: t (hr) 5 562 7 9 1000 892 708 447 355…

A: A numerical problem based on nuclear chemistry, which is to be accomplished.

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: Some watch dials are coated with a phosphor, like ZnS, and a polymer in which some of the 1 H atoms…

A: Given, The half-life of the tritium is t1/2=12.3 yr. Time t is 50 yr. The rate constant can be…

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

A:

Q: Carbon dating can be applied to organic materials up to 5.0 x 10* years old. What percentage of the…

A: Half life is 5730 year . It is given that we want to measure 50000 year .  So time of half life to…

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: The first-order decay of radon has a half-life of 3.823 days. How many grams of radon remain after…

A: Given,

Q: 5. Strontium-90 has a half life of 28.8 years. If you start with a 10 gram sample of Strontium-90,…

A: We have to predict the amount after 115.2 years.

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.