Question 1 Initially, 200 million radioactive substances were present. After 12 hours the mass has decreased by 6%. If the rate of decay is proportional to the amount of substance present at time t find the amount of remaining after 48 hours. Question 2 Determine the half-life of the radioactive substance described in Problem 1.

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: 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 certain radioactive substance decays at a rate proportional to the amount present. If a quarter of…

A: quarter of a radioactive substance decayed after 35 hours

Q: CHAPTER TEN RATES OF REACTIONS AND FACTORS AFFECTING IT The half-life of bismuth-212 is 1 hour. If…

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Q: [Refere A 1.14 g sample of a radioactive isotope decays to 0.87 g in 36.3 hr. What is the half-life…

A: Given  Initial Amount [ A ]0   = 1.15 gram  Remaining Amount [ A ]    = 0.87 gram  Time ( t ) = 36.3…

Q: What is the half-life of the bizarre isotope Toddium - 419 (it is a makeup element) if after 4.00…

A: Time period, t = 4.00 weeks Initial amount, [A]o =950.0 g Final amount, [A] = 29.6875 g Calculation…

Q: The half-life time of an isotope of element X is 7.4 hours. Assuming that you start with 431 mg of…

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Q: Complete the given table. Round half-lives to one decimal place and values of k to six decimal…

A: The exponential decay of the radioactive substance is given as A = A0ekt The amount of radioactive…

Q: The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 × 10 years. Suppose…

A: The half-life is  .The initial amount is .The final amount is .To find the age of the rock.

Q: One of the radioactive isotopes used in medical treatment or analysis is phosphorus-32. The…

A: Expression for half-life period of radioactive element is given as,…

Q: The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate…

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Q: Question 6: Radioactivity (See textbook Chapter 6 - Exercise 6) Cf has a half-life of 2.64 years. It…

A: 252Cf is a radioactive element. It has half life of 2.64years. The half life for decay by…

Q: What is the half life of radioistope if it decays to 12.5% of its radioactivity in 12 years?

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Q: ou start with 2.00 moles of radioactive element with a half-life of 146 days. How many days until…

A: All decay reactions follow first-order kinetics.The initial number of moles of the element = 2.00…

Q: After 60 days, 10 grams of radioactive isotope remains from an original 27 g sample. What is the…

A: Given,

Q: a rock conatains 0.257mg of Pb-206 for every milligram of U-238. The half-life for the decay of…

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Q: The first-order decay of radon has a half-life of 91.75 hours. How many grams of radon remain after…

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Q: PLutonium-239, one of the radioactive by-products of nuclear power, represents a serious was…

A: Chemical kinetics is the study of the reaction that how fast or slow a reaction is taking place. The…

Q: The half life for Carbon-14 is 5730 years. Calculate the amount of time it would take 60.0 g of…

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Q: A hepatobiliary scan is a common technique used to assess the functionality of a patient's…

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Q: The half-life of sodium-24 is 15 hr. If a sample initially contains 40. g of sodium-24, how much…

A: Radioactive reactions are First order reactions. Half life of Sodium-24 is 15 hr. Initial…

Q: ives? A sample of Oxygen-19 has decayed down to 1/32 of its initial concentration a What is the…

A: We have to find half life

Q: 8. Radioactive Iodine-131, with a half-life of eight days, is a common fission product and thus is…

A: The expression for the first order radioactive decay is shown below: Where; t = time A0 = initial…

Q: [Review Topics] [References] Use the References to access important values if needed for this…

A: Interpretation -  To determine the the age of the artifact , when a radioactive isotope carbon-14…

Q: 3. Initially 100 millions of radioactive substance was present. After 6 hours the mass has decreased…

A: Given, Radioactive substance is = 100 million. Time is = 6 hrs for mass decrease by 6%. The rate of…

Q: Chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells The half-life…

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Q: The natural abundance of 14C in the earth's atmosphere and all living organisms is approximately…

A: Half-life is the time taken for the reactant to reduce the amount of the isotope to half its initial…

Q: Carbon 14 decays to carbon12. The half-life of the C14 isotope is 5730 years. 3000 years after an…

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

A: Given  Half life ( t1/2 ) = 3.823 days  Time ( t )          = 5.55 day  Initial Amount ( A0 )   = 80…

Q: In medical application prior to having an MRI, a patient will be administered a dye containing a…

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Q: Element X has a half-life of 6 hours. How much of X remains from a 64kg sample after one day?

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Q: 4. How long will it take for a sample of iron-55 to decay to 1/64 of its original mass if iron- has…

A: Radioactive decays are always first order reaction. So we will use rate law equation of first order…

Q: A scientist has a 1.2-g sample of pure strontium-91,  9138Sr. The half-life of strontium-91 is…

A: Given, mass of sample = 1.2 g half life , t1/2=9.70 h

Q: Phosphorus-32 is a radioactive isotope used as a tracer in the liver. How much phosphorus-32 was…

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Q: If 28.0% of a sample of gallium-66 decays in 4.46 hours, what is the half-life of this isotope (in…

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Q: he half-life of polonium-210 is about 140 days. How much of a 150g sample remains after t years?

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

Q: The half life of the radioactive element ubtonium-31 is 10 seconds. If 80 grams of unobtanium-31 are…

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Q: The half-lives of all the isotopes in the uranium decay series are short when compared to…

A: Answer:The numbers mentioned before the chemical species in a balanced chemical equation is called…

Q: Isotope X has a half-life of 71.8 years. If a sample initially contains 676. mg of X, what mass of X…

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Q: How long long does it take for 78 % of sample of cobalt-60 to decay (the half life is 5,26 years)?

A: The rate of a reaction is expressed as: Rate = k[A]n where k is the rate constant, [A] is the…

Q: If a rock sample was found to contain 1.27 x 10-7 mol of argon-40, how much potassium-40 would also…

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Q: The half-life of a certain radioactive substance is 14 days. There are 6.6 g present initially.…

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Q: The half life for the decay of carbon-14 is 5.73 × 10³ years. Suppose the activity due to the…

A: Given data : Half life, t1/2 = 5.73×103 yearsActivity of fresh wood, [A⁠⁠⁠⁠⁠⁠⁠]0 = 66 Bq. Activity…

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.