A laboratory investigation shows that a sample of uranium ore contains 7.92 mg of 23892U (molar mass 238.05079 g/mol) and 1.85 mg of 20682Pb (molar mass 205.97447 g/mol). Calculate the age of the ore. The half-life of 23892U is 4.5×109 yr. ____yr

Q: Uranium -238 decays in a series of steps to Pb-206. When the material is very old, one can treat the…

A: Radioactive decay follows 1st order reaction.  Given the half-life, t1/2 = 4.50*109 yr

Q: If a sample of 131La goes from 450 picocuries to 100 picocuries in 185 minutes, what is its…

A:

Q: A laboratory investigation shows that a sample of uranium ore contains 10.88 mg of 238U 92 206…

A: Radioactive decay is the process where the unstable nuclei get converted into stable daughter nuclei…

Q: Uranium is radioactive and decays into lead.  This process can be used to date rocks.  A piece of…

A: This problem is based on nuclear chemistry. We know radioactive decay follows first order chemical…

Q: How much time in years (assume a 365 day year for each year) would it take for a 1.805 g sample of…

A:

Q: Phosphorus-32 is a radioactive isotope with a half-life of 14.3 d (d = days). A biochemist has a…

A: A radioactive decay follows the first order kinetics where the rate of the reaction depends on the…

Q: A laboratory investigation shows that a sample of uranium ore contains 5.66 mg of 92U and 2.56 mg of…

A: Given data:

Q: Beginning with 1.00 g of a sample of an unknown radioactive isotope, 0.05674 g of the isotope will…

A: The answer to the following question is-

Q: 21. Barium – 122 has a half-life of 2 minutes. Suppose you obtain a sample weighing 10.0 g and it…

A: 21. Given that: Half life of Barium-122 = 2 mins. Time taken for the set up = 10 mins

Q: Moonrock collected by a US Apollo mission is estimated to be 4.30 billion years old by uranium/ lead…

A:

Q: How much time in minutes would it take for a 2.301 g sample of 3H to decay to a mass of 1.789 g if…

A: The initial concentration (N0), final concentration (N), and time (t) required to convert the…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A: Since this is a first order decay The rate constant with half life is given by…

Q: A shell fossil that originally contained 100 mg of carbon-14 non contains 75 mg of the isotope.…

A: Initial amount, [A]0 = 100 mg  Final amount, [A] = 75 mg  Half-life, t1/2 = 5570 years

Q: 8. What mass of plutonium-240 will remain after 32,820 years if the initial sample contained 4.8 g…

A: No. of half lives = Total time/ half- lives n = 32820/6564 = 5 n = 5

Q: A sample of uranium ore contains 5.37 mg of U-238 and 2.52 mg of Pb-206. (a) Calculate the…

A: Given mass of U-238 = 0.00537 g Number of moles of U-238 = 0.00537/238 = 2.26 × 10-5 mol Given mass…

Q: Cs-134 has a half-life of 2.0 years. How much of a 2.50-g sample of this isotope will remain after…

A: Given :- half life of Cs-134 = 2.0 years                Initial amount of sample = 2.50-g  To…

Q: A laboratory investigation shows that a sample of uranium ore contains 7.92 mg of 238U (molar 92…

A: Mass of U92238 = 7.92 mg = 0.00792 g  Molar Mass of U92238 = 238.05079 g/mol  Half life of U92238 =…

Q: A rock containing 238U and 206Pb was examined to determine its approximate age. The sample of a rock…

A:

Q: None

A:

Q: The half life of the decay process of 238?238U to 206??206Pb is 4.5x109 yr.   A laboratory…

A: Radioactive decay obeys first order decay kinetics  Nt = N0 exp(-0.693/t1/2)×t Where, t = age of the…

Q: The half life of a radioactive iodine is 8 days. How long will it take for 0.25 g of radioactive…

A:

Q: Plutonium 240, 240 24PU, has a half life of 6500 years. The new element formed after Plutonium 240…

A: While writing nuclear reaction the sum of mass number on reactant and product side are equal. Same…

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 of 232Th is 1.4×10 yr. Find the number of disintegrations per hour emitted by 1.0 mol…

A:

Q: The half life of 21 At is 7.214 hours. What fraction of a sample of21At will remain after 3.141…

A:

Q: A 27.00 gg sample of water containing tritium, 3-1H, emits 1250 beta particles per second. Tritium…

A:

Q: Part 1 The half-lives of 235U and 23$U are 7.04 x 10° years and 4.47 x 10° years, respectively, and…

A:

Q: While in the upper peninsula, you have found an unusual fossil in a rock layer that you are really…

A:

Q: The half life of 52Fe is 8.28 hours. Suppose we measure the activity of a sample containing 52Fe and…

A: Calculation of disintegration constant (λ):T1/2 of 52Fe is = 8.28 hours.

Q: if 8.000 grams of U-234 are sealed in a container and then opened many years later -- how much time…

A:

Q: Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a…

A:

Q: How much time is required to reduce a 1 kg sample to about 1 gram if the half life of cesium-137 is…

A:

Q: The radioactive isotope phosphorus-32 is often used in biochemical research. Its half-life is 14.28…

A: Given: The half-life of phosphorus-32 is 14.28 days. The mass of sample of K332PO4 is 118 mg.

Q: How much time in hours would it take for a 1.330 g sample of 233Pa to decay to a mass of 0.8628 g if…

A: Given, Half life = 5.1473 x 106 s Initial Mass of sample = 1.330 g  Time = ?

Q: The half-life of 14C is 5730 yr. Find the number of disintegrations per hour emitted by 1.0 mol of…

A: half-life of 14C is 5730 yr.

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.